http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/8fe7f4b1/extensions/aria_extension_tosca/simple_v1_0/modeling/properties.py
----------------------------------------------------------------------
diff --git a/extensions/aria_extension_tosca/simple_v1_0/modeling/properties.py 
b/extensions/aria_extension_tosca/simple_v1_0/modeling/properties.py
deleted file mode 100644
index 9c3ea42..0000000
--- a/extensions/aria_extension_tosca/simple_v1_0/modeling/properties.py
+++ /dev/null
@@ -1,202 +0,0 @@
-# Licensed to the Apache Software Foundation (ASF) under one or more
-# contributor license agreements.  See the NOTICE file distributed with
-# this work for additional information regarding copyright ownership.
-# The ASF licenses this file to You under the Apache License, Version 2.0
-# (the "License"); you may not use this file except in compliance with
-# the License.  You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-from aria.utils.collections import merge, deepcopy_with_locators, OrderedDict
-from aria.parser.presentation import Value
-from aria.parser.validation import Issue
-
-from .data_types import coerce_value
-
-#
-# ArtifactType, DataType, CapabilityType, RelationshipType, NodeType, 
GroupType, PolicyType
-#
-
-# Works on properties, parameters, inputs, and attributes
-def get_inherited_property_definitions(context, presentation, field_name, 
for_presentation=None):
-    """
-    Returns our property definitions added on top of those of our parent, if 
we have one
-    (recursively).
-
-    Allows overriding all aspects of parent properties except data type.
-    """
-
-    # Get definitions from parent
-    # If we inherit from a primitive, it does not have a parent:
-    parent = presentation._get_parent(context) if hasattr(presentation, 
'_get_parent') else None
-    definitions = get_inherited_property_definitions(context, parent, 
field_name,
-                                                     
for_presentation=presentation) \
-                                                     if parent is not None 
else OrderedDict()
-
-    # Add/merge our definitions
-    # If we inherit from a primitive, it does not have our field
-    our_definitions = getattr(presentation, field_name, None)
-    if our_definitions:
-        our_definitions_clone = OrderedDict()
-        for name, our_definition in our_definitions.iteritems():
-            our_definitions_clone[name] = 
our_definition._clone(for_presentation)
-        our_definitions = our_definitions_clone
-        merge_property_definitions(context, presentation, definitions, 
our_definitions, field_name)
-
-    for definition in definitions.itervalues():
-        definition._reset_method_cache()
-
-    return definitions
-
-#
-# NodeTemplate, RelationshipTemplate, GroupTemplate, PolicyTemplate
-#
-
-def get_assigned_and_defined_property_values(context, presentation, 
field_name='property',
-                                             field_name_plural='properties'):
-    """
-    Returns the assigned property values while making sure they are defined in 
our type.
-
-    The property definition's default value, if available, will be used if we 
did not assign it.
-
-    Makes sure that required properties indeed end up with a value.
-    """
-
-    values = OrderedDict()
-
-    the_type = presentation._get_type(context)
-    assignments = getattr(presentation, field_name_plural)
-    get_fn_name = '_get_{0}'.format(field_name_plural)
-    definitions = getattr(the_type, get_fn_name)(context) if the_type is not 
None else None
-
-    # Fill in our assignments, but make sure they are defined
-    if assignments:
-        for name, value in assignments.iteritems():
-            if (definitions is not None) and (name in definitions):
-                definition = definitions[name]
-                values[name] = coerce_property_value(context, value, 
definition, value.value)
-            else:
-                context.validation.report('assignment to undefined {0} "{1}" 
in "{2}"'
-                                          .format(field_name, name, 
presentation._fullname),
-                                          locator=value._locator, 
level=Issue.BETWEEN_TYPES)
-
-    # Fill in defaults from the definitions
-    if definitions:
-        for name, definition in definitions.iteritems():
-            if values.get(name) is None:
-                values[name] = coerce_property_value(context, presentation, 
definition,
-                                                     definition.default)
-
-    validate_required_values(context, presentation, values, definitions)
-
-    return values
-
-#
-# TopologyTemplate
-#
-
-def get_parameter_values(context, presentation, field_name):
-    values = OrderedDict()
-
-    parameters = getattr(presentation, field_name)
-
-    # Fill in defaults and values
-    if parameters:
-        for name, parameter in parameters.iteritems():
-            if values.get(name) is None:
-                if hasattr(parameter, 'value') and (parameter.value is not 
None):
-                    # For parameters only:
-                    values[name] = coerce_property_value(context, 
presentation, parameter,
-                                                         parameter.value)
-                else:
-                    default = parameter.default if hasattr(parameter, 
'default') else None
-                    values[name] = coerce_property_value(context, 
presentation, parameter, default)
-
-    return values
-
-#
-# Utils
-#
-
-def validate_required_values(context, presentation, values, definitions):
-    """
-    Check if required properties have not been assigned.
-    """
-
-    if not definitions:
-        return
-    for name, definition in definitions.iteritems():
-        if getattr(definition, 'required', False) \
-            and ((values is None) or (values.get(name) is None)):
-            context.validation.report('required property "%s" is not assigned 
a value in "%s"'
-                                      % (name, presentation._fullname),
-                                      
locator=presentation._get_child_locator('properties'),
-                                      level=Issue.BETWEEN_TYPES)
-
-def merge_raw_property_definition(context, presentation, 
raw_property_definition,
-                                  our_property_definition, field_name, 
property_name):
-    # Check if we changed the type
-    # TODO: allow a sub-type?
-    type1 = raw_property_definition.get('type')
-    type2 = our_property_definition.type
-    if type1 != type2:
-        context.validation.report(
-            'override changes type from "%s" to "%s" for property "%s" in "%s"'
-            % (type1, type2, property_name, presentation._fullname),
-            locator=presentation._get_child_locator(field_name, property_name),
-            level=Issue.BETWEEN_TYPES)
-
-    merge(raw_property_definition, our_property_definition._raw)
-
-def merge_raw_property_definitions(context, presentation, 
raw_property_definitions,
-                                   our_property_definitions, field_name):
-    if not our_property_definitions:
-        return
-    for property_name, our_property_definition in 
our_property_definitions.iteritems():
-        if property_name in raw_property_definitions:
-            raw_property_definition = raw_property_definitions[property_name]
-            merge_raw_property_definition(context, presentation, 
raw_property_definition,
-                                          our_property_definition, field_name, 
property_name)
-        else:
-            raw_property_definitions[property_name] = \
-                deepcopy_with_locators(our_property_definition._raw)
-
-def merge_property_definitions(context, presentation, property_definitions,
-                               our_property_definitions, field_name):
-    if not our_property_definitions:
-        return
-    for property_name, our_property_definition in 
our_property_definitions.iteritems():
-        if property_name in property_definitions:
-            property_definition = property_definitions[property_name]
-            merge_raw_property_definition(context, presentation, 
property_definition._raw,
-                                          our_property_definition, field_name, 
property_name)
-        else:
-            property_definitions[property_name] = our_property_definition
-
-# Works on properties, inputs, and parameters
-def coerce_property_value(context, presentation, definition, value, 
aspect=None):
-    the_type = definition._get_type(context) if definition is not None else 
None
-    entry_schema = definition.entry_schema if definition is not None else None
-    constraints = definition._get_constraints(context) \
-        if ((definition is not None) and hasattr(definition, 
'_get_constraints')) else None
-    value = coerce_value(context, presentation, the_type, entry_schema, 
constraints, value, aspect)
-    if (the_type is not None) and hasattr(the_type, '_name'):
-        type_name = the_type._name
-    else:
-        type_name = getattr(definition, 'type', None)
-    description = getattr(definition, 'description', None)
-    description = description.value if description is not None else None
-    return Value(type_name, value, description)
-
-def convert_property_definitions_to_values(context, definitions):
-    values = OrderedDict()
-    for name, definition in definitions.iteritems():
-        default = definition.default
-        values[name] = coerce_property_value(context, definition, definition, 
default)
-    return values

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/8fe7f4b1/extensions/aria_extension_tosca/simple_v1_0/modeling/requirements.py
----------------------------------------------------------------------
diff --git 
a/extensions/aria_extension_tosca/simple_v1_0/modeling/requirements.py 
b/extensions/aria_extension_tosca/simple_v1_0/modeling/requirements.py
index 2a68da2..6bdb5b1 100644
--- a/extensions/aria_extension_tosca/simple_v1_0/modeling/requirements.py
+++ b/extensions/aria_extension_tosca/simple_v1_0/modeling/requirements.py
@@ -14,13 +14,14 @@
 # limitations under the License.
 
 from aria.parser.validation import Issue
-from aria.utils.collections import deepcopy_with_locators, OrderedDict
+from aria.utils.collections import (deepcopy_with_locators, OrderedDict)
 
-from .properties import (convert_property_definitions_to_values, 
validate_required_values,
-                         coerce_property_value)
+from .parameters import (convert_parameter_definitions_to_values, 
validate_required_values,
+                         coerce_parameter_value)
 from .interfaces import 
(convert_requirement_interface_definitions_from_type_to_raw_template,
                          merge_interface_definitions, merge_interface, 
validate_required_inputs)
 
+
 #
 # NodeType
 #
@@ -49,6 +50,7 @@ def get_inherited_requirement_definitions(context, 
presentation):
 
     return requirement_definitions
 
+
 #
 # NodeTemplate
 #
@@ -127,6 +129,7 @@ def get_template_requirements(context, presentation):
 
     return requirement_assignments
 
+
 #
 # Utils
 #
@@ -195,8 +198,8 @@ def 
convert_requirement_from_definition_to_assignment(context, requirement_defin
             if relationship_property_definitions:
                 # Convert property definitions to values
                 raw['relationship']['properties'] = \
-                    convert_property_definitions_to_values(context,
-                                                           
relationship_property_definitions)
+                    convert_parameter_definitions_to_values(context,
+                                                            
relationship_property_definitions)
 
         # These are our interface definitions
         # InterfaceDefinition:
@@ -229,6 +232,7 @@ def 
convert_requirement_from_definition_to_assignment(context, requirement_defin
         relationship_property_definitions, \
         relationship_interface_definitions
 
+
 def add_requirement_assignments(context, presentation, requirement_assignments,
                                 requirement_definitions, 
our_requirement_assignments):
     for requirement_name, our_requirement_assignment in 
our_requirement_assignments:
@@ -258,6 +262,7 @@ def add_requirement_assignments(context, presentation, 
requirement_assignments,
                                       
locator=our_requirement_assignment._locator,
                                       level=Issue.BETWEEN_TYPES)
 
+
 def merge_requirement_assignment(context, relationship_property_definitions,
                                  relationship_interface_definitions, 
requirement, our_requirement):
     our_capability = our_requirement.capability
@@ -283,6 +288,7 @@ def merge_requirement_assignment(context, 
relationship_property_definitions,
                                                   
relationship_interface_definitions,
                                                   requirement, 
our_relationship)
 
+
 def merge_requirement_assignment_relationship(context, presentation, 
property_definitions,
                                               interface_definitions, 
requirement, our_relationship):
     our_relationship_properties = our_relationship._raw.get('properties')
@@ -296,7 +302,7 @@ def merge_requirement_assignment_relationship(context, 
presentation, property_de
             if property_name in property_definitions:
                 definition = property_definitions[property_name]
                 requirement._raw['relationship']['properties'][property_name] 
= \
-                    coerce_property_value(context, presentation, definition, 
prop)
+                    coerce_parameter_value(context, presentation, definition, 
prop)
             else:
                 context.validation.report(
                     'relationship property "%s" not declared at definition of 
requirement "%s"'
@@ -330,6 +336,7 @@ def merge_requirement_assignment_relationship(context, 
presentation, property_de
                        presentation._container._container._fullname),
                     locator=our_relationship._locator, 
level=Issue.BETWEEN_TYPES)
 
+
 def validate_requirement_assignment(context, presentation, 
requirement_assignment,
                                     relationship_property_definitions,
                                     relationship_interface_definitions):
@@ -348,6 +355,7 @@ def validate_requirement_assignment(context, presentation, 
requirement_assignmen
             validate_required_inputs(context, presentation, 
interface_assignment,
                                      relationship_interface_definition, None, 
interface_name)
 
+
 def get_first_requirement(requirement_definitions, name):
     if requirement_definitions is not None:
         for requirement_name, requirement_definition in 
requirement_definitions:

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/8fe7f4b1/extensions/aria_extension_tosca/simple_v1_0/modeling/substitution_mappings.py
----------------------------------------------------------------------
diff --git 
a/extensions/aria_extension_tosca/simple_v1_0/modeling/substitution_mappings.py 
b/extensions/aria_extension_tosca/simple_v1_0/modeling/substitution_mappings.py
index c1e21de..8f7ec4c 100644
--- 
a/extensions/aria_extension_tosca/simple_v1_0/modeling/substitution_mappings.py
+++ 
b/extensions/aria_extension_tosca/simple_v1_0/modeling/substitution_mappings.py
@@ -16,6 +16,7 @@
 from aria.utils.formatting import safe_repr
 from aria.parser.validation import Issue
 
+
 def validate_subtitution_mappings_requirement(context, presentation):
     if not validate_format(context, presentation, 'requirement'):
         return
@@ -57,6 +58,7 @@ def validate_subtitution_mappings_requirement(context, 
presentation):
             locator=presentation._locator, level=Issue.BETWEEN_TYPES)
         return
 
+
 def validate_subtitution_mappings_capability(context, presentation):
     if not validate_format(context, presentation, 'capability'):
         return
@@ -99,6 +101,7 @@ def validate_subtitution_mappings_capability(context, 
presentation):
             % (capability_type._name, presentation._name, 
type_capability_type._name),
             locator=presentation._locator, level=Issue.BETWEEN_TYPES)
 
+
 #
 # Utils
 #
@@ -114,6 +117,7 @@ def validate_format(context, presentation, name):
         return False
     return True
 
+
 def get_node_template(context, presentation, name):
     node_template_name = presentation._raw[0]
     node_template = context.presentation.get_from_dict('service_template', 
'topology_template',

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/8fe7f4b1/extensions/aria_extension_tosca/simple_v1_0/templates.py
----------------------------------------------------------------------
diff --git a/extensions/aria_extension_tosca/simple_v1_0/templates.py 
b/extensions/aria_extension_tosca/simple_v1_0/templates.py
index ce6b5d9..123a00e 100644
--- a/extensions/aria_extension_tosca/simple_v1_0/templates.py
+++ b/extensions/aria_extension_tosca/simple_v1_0/templates.py
@@ -26,7 +26,7 @@ from .assignments import (PropertyAssignment, 
AttributeAssignment, RequirementAs
 from .definitions import ParameterDefinition
 from .filters import NodeFilter
 from .misc import (Description, MetaData, Repository, Import, 
SubstitutionMappings)
-from .modeling.properties import (get_assigned_and_defined_property_values, 
get_parameter_values)
+from .modeling.parameters import (get_assigned_and_defined_parameter_values, 
get_parameter_values)
 from .modeling.interfaces import get_template_interfaces
 from .modeling.requirements import get_template_requirements
 from .modeling.capabilities import get_template_capabilities
@@ -157,12 +157,11 @@ class NodeTemplate(ExtensiblePresentation):
 
     @cachedmethod
     def _get_property_values(self, context):
-        return FrozenDict(get_assigned_and_defined_property_values(context, 
self))
+        return FrozenDict(get_assigned_and_defined_parameter_values(context, 
self, 'property'))
 
     @cachedmethod
     def _get_attribute_default_values(self, context):
-        return FrozenDict(get_assigned_and_defined_property_values(context, 
self,
-                                                                   
'attribute', 'attributes'))
+        return FrozenDict(get_assigned_and_defined_parameter_values(context, 
self, 'attribute'))
 
     @cachedmethod
     def _get_requirements(self, context):
@@ -281,7 +280,7 @@ class RelationshipTemplate(ExtensiblePresentation):
 
     @cachedmethod
     def _get_property_values(self, context):
-        return FrozenDict(get_assigned_and_defined_property_values(context, 
self))
+        return FrozenDict(get_assigned_and_defined_parameter_values(context, 
self, 'property'))
 
     @cachedmethod
     def _get_interfaces(self, context):
@@ -363,7 +362,7 @@ class GroupTemplate(ExtensiblePresentation):
 
     @cachedmethod
     def _get_property_values(self, context):
-        return FrozenDict(get_assigned_and_defined_property_values(context, 
self))
+        return FrozenDict(get_assigned_and_defined_parameter_values(context, 
self, 'property'))
 
     @cachedmethod
     def _get_interfaces(self, context):
@@ -427,7 +426,7 @@ class PolicyTemplate(ExtensiblePresentation):
 
     @cachedmethod
     def _get_property_values(self, context):
-        return FrozenDict(get_assigned_and_defined_property_values(context, 
self))
+        return FrozenDict(get_assigned_and_defined_parameter_values(context, 
self, 'property'))
 
     @cachedmethod
     def _get_targets(self, context):

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/8fe7f4b1/extensions/aria_extension_tosca/simple_v1_0/types.py
----------------------------------------------------------------------
diff --git a/extensions/aria_extension_tosca/simple_v1_0/types.py 
b/extensions/aria_extension_tosca/simple_v1_0/types.py
index bc80eb9..d97b89c 100644
--- a/extensions/aria_extension_tosca/simple_v1_0/types.py
+++ b/extensions/aria_extension_tosca/simple_v1_0/types.py
@@ -33,9 +33,9 @@ from .modeling.capabilities import 
(get_inherited_valid_source_types,
                                     get_inherited_capability_definitions)
 from .modeling.data_types import (get_data_type, get_inherited_constraints, 
coerce_data_type_value,
                                   validate_data_type_name)
-from .modeling.interfaces import get_inherited_interface_definitions, 
get_inherited_operations
+from .modeling.interfaces import (get_inherited_interface_definitions, 
get_inherited_operations)
 from .modeling.policies import get_inherited_targets
-from .modeling.properties import get_inherited_property_definitions
+from .modeling.parameters import get_inherited_parameter_definitions
 from .modeling.requirements import get_inherited_requirement_definitions
 from .presentation.extensible import ExtensiblePresentation
 from .presentation.field_getters import data_type_class_getter
@@ -115,7 +115,7 @@ class ArtifactType(ExtensiblePresentation):
 
     @cachedmethod
     def _get_properties(self, context):
-        return FrozenDict(get_inherited_property_definitions(context, self, 
'properties'))
+        return FrozenDict(get_inherited_parameter_definitions(context, self, 
'properties'))
 
     def _validate(self, context):
         super(ArtifactType, self)._validate(context)
@@ -201,7 +201,7 @@ class DataType(ExtensiblePresentation):
 
     @cachedmethod
     def _get_properties(self, context):
-        return FrozenDict(get_inherited_property_definitions(context, self, 
'properties'))
+        return FrozenDict(get_inherited_parameter_definitions(context, self, 
'properties'))
 
     @cachedmethod
     def _get_constraints(self, context):
@@ -307,7 +307,7 @@ class CapabilityType(ExtensiblePresentation):
 
     @cachedmethod
     def _get_properties(self, context):
-        return FrozenDict(get_inherited_property_definitions(context, self, 
'properties'))
+        return FrozenDict(get_inherited_parameter_definitions(context, self, 
'properties'))
 
     @cachedmethod
     def _get_valid_source_types(self, context):
@@ -385,7 +385,7 @@ class InterfaceType(ExtensiblePresentation):
 
     @cachedmethod
     def _get_inputs(self, context):
-        return FrozenDict(get_inherited_property_definitions(context, self, 
'inputs'))
+        return FrozenDict(get_inherited_parameter_definitions(context, self, 
'inputs'))
 
     @cachedmethod
     def _get_operations(self, context):
@@ -493,11 +493,11 @@ class RelationshipType(ExtensiblePresentation):
 
     @cachedmethod
     def _get_properties(self, context):
-        return FrozenDict(get_inherited_property_definitions(context, self, 
'properties'))
+        return FrozenDict(get_inherited_parameter_definitions(context, self, 
'properties'))
 
     @cachedmethod
     def _get_attributes(self, context):
-        return FrozenDict(get_inherited_property_definitions(context, self, 
'attributes'))
+        return FrozenDict(get_inherited_parameter_definitions(context, self, 
'attributes'))
 
     @cachedmethod
     def _get_interfaces(self, context):
@@ -624,11 +624,11 @@ class NodeType(ExtensiblePresentation):
 
     @cachedmethod
     def _get_properties(self, context):
-        return FrozenDict(get_inherited_property_definitions(context, self, 
'properties'))
+        return FrozenDict(get_inherited_parameter_definitions(context, self, 
'properties'))
 
     @cachedmethod
     def _get_attributes(self, context):
-        return FrozenDict(get_inherited_property_definitions(context, self, 
'attributes'))
+        return FrozenDict(get_inherited_parameter_definitions(context, self, 
'attributes'))
 
     @cachedmethod
     def _get_requirements(self, context):
@@ -760,7 +760,7 @@ class GroupType(ExtensiblePresentation):
 
     @cachedmethod
     def _get_properties(self, context):
-        return FrozenDict(get_inherited_property_definitions(context, self, 
'properties'))
+        return FrozenDict(get_inherited_parameter_definitions(context, self, 
'properties'))
 
     @cachedmethod
     def _get_interfaces(self, context):
@@ -848,7 +848,7 @@ class PolicyType(ExtensiblePresentation):
 
     @cachedmethod
     def _get_properties(self, context):
-        return FrozenDict(get_inherited_property_definitions(context, self, 
'properties'))
+        return FrozenDict(get_inherited_parameter_definitions(context, self, 
'properties'))
 
     @cachedmethod
     def _get_targets(self, context):

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/8fe7f4b1/tests/cli/test_services.py
----------------------------------------------------------------------
diff --git a/tests/cli/test_services.py b/tests/cli/test_services.py
index b1a6ee4..e5717cc 100644
--- a/tests/cli/test_services.py
+++ b/tests/cli/test_services.py
@@ -19,7 +19,7 @@ import mock
 from aria.cli.env import _Environment
 from aria.core import Core
 from aria.exceptions import DependentActiveExecutionsError, 
DependentAvailableNodesError
-from aria.modeling.exceptions import InputsException
+from aria.modeling.exceptions import ParameterException
 from aria.storage import exceptions as storage_exceptions
 
 from .base_test import (  # pylint: disable=unused-import
@@ -120,11 +120,11 @@ class TestServicesCreate(TestCliBase):
         monkeypatch.setattr(_Environment, 'model_storage', mock_storage)
         monkeypatch.setattr(Core,
                             'create_service',
-                            raise_exception(InputsException))
+                            raise_exception(ParameterException))
 
         assert_exception_raised(
             self.invoke('services create -t with_inputs test_s'),
-            expected_exception=InputsException)
+            expected_exception=ParameterException)
 
         assert "Service created. The service's name is test_s" not in 
self.logger_output_string
 
@@ -152,8 +152,8 @@ class TestServicesDelete(TestCliBase):
         assert_exception_raised(
             self.invoke('services delete test_s'),
             expected_exception=DependentActiveExecutionsError,
-            expected_msg="Can't delete service {name} - there is an active 
execution "
-                         "for this service. Active execution id: 1".format(
+            expected_msg="Can't delete service `{name}` - there is an active 
execution "
+                         "for this service. Active execution ID: 1".format(
                              name=mock_models.SERVICE_NAME))
 
     def test_delete_available_nodes_error(self, monkeypatch, mock_storage):
@@ -161,8 +161,8 @@ class TestServicesDelete(TestCliBase):
         assert_exception_raised(
             self.invoke('services delete test_s'),
             expected_exception=DependentAvailableNodesError,
-            expected_msg="Can't delete service {name} - there are available 
nodes "
-                         "for this service. Available node ids: 1".format(
+            expected_msg="Can't delete service `{name}` - there are available 
nodes "
+                         "for this service. Available node IDs: 1".format(
                              name=mock_models.SERVICE_NAME))
 
     def test_delete_available_nodes_error_with_force(self, monkeypatch, 
mock_storage):

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/8fe7f4b1/tests/mock/models.py
----------------------------------------------------------------------
diff --git a/tests/mock/models.py b/tests/mock/models.py
index 98703d5..50aa340 100644
--- a/tests/mock/models.py
+++ b/tests/mock/models.py
@@ -225,11 +225,11 @@ def create_interface(service, interface_name, 
operation_name, operation_kwargs=N
                      interface_kwargs=None):
     the_type = 
service.service_template.interface_types.get_descendant('test_interface_type')
 
-    if operation_kwargs and operation_kwargs.get('inputs'):
-        operation_kwargs['inputs'] = dict(
-            (input_name, models.Parameter.wrap(input_name, input_value))
-            for input_name, input_value in 
operation_kwargs['inputs'].iteritems()
-            if input_value is not None)
+    if operation_kwargs and operation_kwargs.get('arguments'):
+        operation_kwargs['arguments'] = dict(
+            (argument_name, models.Parameter.wrap(argument_name, 
argument_value))
+            for argument_name, argument_value in 
operation_kwargs['arguments'].iteritems()
+            if argument_value is not None)
 
     operation = models.Operation(
         name=operation_name,

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/8fe7f4b1/tests/mock/topology.py
----------------------------------------------------------------------
diff --git a/tests/mock/topology.py b/tests/mock/topology.py
index bfb7b4e..ab08dbd 100644
--- a/tests/mock/topology.py
+++ b/tests/mock/topology.py
@@ -27,9 +27,9 @@ def create_simple_topology_single_node(model_storage, 
create_operation):
         service_template,
         'Standard', 'create',
         operation_kwargs=dict(
-            implementation=create_operation,
-            inputs={'key': aria_models.Parameter.wrap('key', 'create'),
-                    'value': aria_models.Parameter.wrap('value', True)})
+            function=create_operation,
+            arguments={'key': aria_models.Parameter.wrap('key', 'create'),
+                       'value': aria_models.Parameter.wrap('value', True)})
     )
     node_template.interface_templates[interface_template.name] = 
interface_template                 # pylint: disable=unsubscriptable-object
 
@@ -38,9 +38,9 @@ def create_simple_topology_single_node(model_storage, 
create_operation):
         service,
         'Standard', 'create',
         operation_kwargs=dict(
-            implementation=create_operation,
-            inputs={'key': aria_models.Parameter.wrap('key', 'create'),
-                    'value': aria_models.Parameter.wrap('value', True)})
+            function=create_operation,
+            arguments={'key': aria_models.Parameter.wrap('key', 'create'),
+                       'value': aria_models.Parameter.wrap('value', True)})
     )
     node.interfaces[interface.name] = interface                                
                     # pylint: disable=unsubscriptable-object
 

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/8fe7f4b1/tests/orchestrator/context/test_operation.py
----------------------------------------------------------------------
diff --git a/tests/orchestrator/context/test_operation.py 
b/tests/orchestrator/context/test_operation.py
index 5d193bc..7dbdd04 100644
--- a/tests/orchestrator/context/test_operation.py
+++ b/tests/orchestrator/context/test_operation.py
@@ -78,14 +78,14 @@ def test_node_operation_task_execution(ctx, 
thread_executor, dataholder):
     interface_name = 'Standard'
     operation_name = 'create'
 
-    inputs = {'putput': True, 'holder_path': dataholder.path}
+    arguments = {'putput': True, 'holder_path': dataholder.path}
     node = ctx.model.node.get_by_name(mock.models.DEPENDENCY_NODE_NAME)
     interface = mock.models.create_interface(
         node.service,
         interface_name,
         operation_name,
-        operation_kwargs=dict(implementation=op_path(basic_node_operation, 
module_path=__name__),
-                              inputs=inputs)
+        operation_kwargs=dict(function=op_path(basic_node_operation, 
module_path=__name__),
+                              arguments=arguments)
     )
     node.interfaces[interface.name] = interface
     ctx.model.node.update(node)
@@ -97,7 +97,7 @@ def test_node_operation_task_execution(ctx, thread_executor, 
dataholder):
                 node,
                 interface_name=interface_name,
                 operation_name=operation_name,
-                inputs=inputs
+                inputs=arguments
             )
         )
 
@@ -115,7 +115,7 @@ def test_node_operation_task_execution(ctx, 
thread_executor, dataholder):
     )
     operations = interface.operations
     assert len(operations) == 1
-    assert dataholder['implementation'] == 
operations.values()[0].implementation             # pylint: disable=no-member
+    assert dataholder['implementation'] == operations.values()[0].function     
        # pylint: disable=no-member
     assert dataholder['inputs']['putput'] is True
 
     # Context based attributes (sugaring)
@@ -127,15 +127,14 @@ def test_relationship_operation_task_execution(ctx, 
thread_executor, dataholder)
     interface_name = 'Configure'
     operation_name = 'post_configure'
 
-    inputs = {'putput': True, 'holder_path': dataholder.path}
+    arguments = {'putput': True, 'holder_path': dataholder.path}
     relationship = ctx.model.relationship.list()[0]
     interface = mock.models.create_interface(
         relationship.source_node.service,
         interface_name,
         operation_name,
-        
operation_kwargs=dict(implementation=op_path(basic_relationship_operation,
-                                                     module_path=__name__),
-                              inputs=inputs),
+        operation_kwargs=dict(function=op_path(basic_relationship_operation, 
module_path=__name__),
+                              arguments=arguments),
     )
 
     relationship.interfaces[interface.name] = interface
@@ -148,7 +147,7 @@ def test_relationship_operation_task_execution(ctx, 
thread_executor, dataholder)
                 relationship,
                 interface_name=interface_name,
                 operation_name=operation_name,
-                inputs=inputs
+                inputs=arguments
             )
         )
 
@@ -160,7 +159,7 @@ def test_relationship_operation_task_execution(ctx, 
thread_executor, dataholder)
     assert dataholder['actor_name'] == relationship.name
     assert interface_name in dataholder['task_name']
     operations = interface.operations
-    assert dataholder['implementation'] == 
operations.values()[0].implementation           # pylint: disable=no-member
+    assert dataholder['implementation'] == operations.values()[0].function     
      # pylint: disable=no-member
     assert dataholder['inputs']['putput'] is True
 
     # Context based attributes (sugaring)
@@ -197,8 +196,8 @@ def test_invalid_task_operation_id(ctx, thread_executor, 
dataholder):
         node.service,
         interface_name=interface_name,
         operation_name=operation_name,
-        operation_kwargs=dict(implementation=op_path(get_node_id, 
module_path=__name__),
-                              inputs={'holder_path': dataholder.path})
+        operation_kwargs=dict(function=op_path(get_node_id, 
module_path=__name__),
+                              arguments={'holder_path': dataholder.path})
     )
     node.interfaces[interface.name] = interface
     ctx.model.node.update(node)
@@ -234,15 +233,15 @@ def test_plugin_workdir(ctx, thread_executor, tmpdir):
     node = ctx.model.node.get_by_name(mock.models.DEPENDENCY_NODE_NAME)
     filename = 'test_file'
     content = 'file content'
-    inputs = {'filename': filename, 'content': content}
+    arguments = {'filename': filename, 'content': content}
     interface = mock.models.create_interface(
         node.service,
         interface_name,
         operation_name,
         operation_kwargs=dict(
-            implementation='{0}.{1}'.format(__name__, 
_test_plugin_workdir.__name__),
+            function='{0}.{1}'.format(__name__, _test_plugin_workdir.__name__),
             plugin=plugin,
-            inputs=inputs)
+            arguments=arguments)
     )
     node.interfaces[interface.name] = interface
     ctx.model.node.update(node)
@@ -253,7 +252,7 @@ def test_plugin_workdir(ctx, thread_executor, tmpdir):
             node,
             interface_name=interface_name,
             operation_name=operation_name,
-            inputs=inputs))
+            inputs=arguments))
 
     execute(workflow_func=basic_workflow, workflow_context=ctx, 
executor=thread_executor)
     expected_file = tmpdir.join('workdir', 'plugins', str(ctx.service.id),
@@ -280,7 +279,7 @@ def test_node_operation_logging(ctx, executor):
 
     node = ctx.model.node.get_by_name(mock.models.DEPENDENCY_NODE_NAME)
 
-    inputs = {
+    arguments = {
         'op_start': 'op_start',
         'op_end': 'op_end',
     }
@@ -289,8 +288,8 @@ def test_node_operation_logging(ctx, executor):
         interface_name,
         operation_name,
         operation_kwargs=dict(
-            implementation=op_path(logged_operation, module_path=__name__),
-            inputs=inputs)
+            function=op_path(logged_operation, module_path=__name__),
+            arguments=arguments)
     )
     node.interfaces[interface.name] = interface
     ctx.model.node.update(node)
@@ -302,19 +301,19 @@ def test_node_operation_logging(ctx, executor):
                 node,
                 interface_name=interface_name,
                 operation_name=operation_name,
-                inputs=inputs
+                inputs=arguments
             )
         )
 
     execute(workflow_func=basic_workflow, workflow_context=ctx, 
executor=executor)
-    _assert_loggins(ctx, inputs)
+    _assert_loggins(ctx, arguments)
 
 
 def test_relationship_operation_logging(ctx, executor):
     interface_name, operation_name = 
mock.operations.RELATIONSHIP_OPERATIONS_INSTALL[0]
 
     relationship = ctx.model.relationship.list()[0]
-    inputs = {
+    arguments = {
         'op_start': 'op_start',
         'op_end': 'op_end',
     }
@@ -322,8 +321,8 @@ def test_relationship_operation_logging(ctx, executor):
         relationship.source_node.service,
         interface_name,
         operation_name,
-        operation_kwargs=dict(implementation=op_path(logged_operation, 
module_path=__name__),
-                              inputs=inputs)
+        operation_kwargs=dict(function=op_path(logged_operation, 
module_path=__name__),
+                              arguments=arguments)
     )
     relationship.interfaces[interface.name] = interface
     ctx.model.relationship.update(relationship)
@@ -335,12 +334,12 @@ def test_relationship_operation_logging(ctx, executor):
                 relationship,
                 interface_name=interface_name,
                 operation_name=operation_name,
-                inputs=inputs
+                inputs=arguments
             )
         )
 
     execute(workflow_func=basic_workflow, workflow_context=ctx, 
executor=executor)
-    _assert_loggins(ctx, inputs)
+    _assert_loggins(ctx, arguments)
 
 
 def test_attribute_consumption(ctx, executor, dataholder):

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/8fe7f4b1/tests/orchestrator/context/test_serialize.py
----------------------------------------------------------------------
diff --git a/tests/orchestrator/context/test_serialize.py 
b/tests/orchestrator/context/test_serialize.py
index 8a5db6f..946b0bd 100644
--- a/tests/orchestrator/context/test_serialize.py
+++ b/tests/orchestrator/context/test_serialize.py
@@ -47,7 +47,7 @@ def _mock_workflow(ctx, graph):
         node.service,
         'test',
         'op',
-        operation_kwargs=dict(implementation=_operation_mapping(),
+        operation_kwargs=dict(function=_operation_mapping(),
                               plugin=plugin)
     )
     node.interfaces[interface.name] = interface

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/8fe7f4b1/tests/orchestrator/context/test_toolbelt.py
----------------------------------------------------------------------
diff --git a/tests/orchestrator/context/test_toolbelt.py 
b/tests/orchestrator/context/test_toolbelt.py
index fc34907..26a15e5 100644
--- a/tests/orchestrator/context/test_toolbelt.py
+++ b/tests/orchestrator/context/test_toolbelt.py
@@ -86,12 +86,12 @@ def test_host_ip(workflow_context, executor, dataholder):
     interface_name = 'Standard'
     operation_name = 'create'
     _, dependency_node, _, _, _ = _get_elements(workflow_context)
-    inputs = {'putput': True, 'holder_path': dataholder.path}
+    arguments = {'putput': True, 'holder_path': dataholder.path}
     interface = mock.models.create_interface(
         dependency_node.service,
         interface_name=interface_name,
         operation_name=operation_name,
-        operation_kwargs=dict(implementation=op_path(host_ip, 
module_path=__name__), inputs=inputs)
+        operation_kwargs=dict(function=op_path(host_ip, module_path=__name__), 
arguments=arguments)
     )
     dependency_node.interfaces[interface.name] = interface
     dependency_node.attributes['ip'] = models.Parameter.wrap('ip', '1.1.1.1')
@@ -105,7 +105,7 @@ def test_host_ip(workflow_context, executor, dataholder):
                 dependency_node,
                 interface_name=interface_name,
                 operation_name=operation_name,
-                inputs=inputs
+                inputs=arguments
             )
         )
 
@@ -118,13 +118,13 @@ def test_relationship_tool_belt(workflow_context, 
executor, dataholder):
     interface_name = 'Configure'
     operation_name = 'post_configure'
     _, _, _, _, relationship = _get_elements(workflow_context)
-    inputs = {'putput': True, 'holder_path': dataholder.path}
+    arguments = {'putput': True, 'holder_path': dataholder.path}
     interface = mock.models.create_interface(
         relationship.source_node.service,
         interface_name=interface_name,
         operation_name=operation_name,
-        operation_kwargs=dict(implementation=op_path(relationship_operation, 
module_path=__name__),
-                              inputs=inputs)
+        operation_kwargs=dict(function=op_path(relationship_operation, 
module_path=__name__),
+                              arguments=arguments)
     )
     relationship.interfaces[interface.name] = interface
     workflow_context.model.relationship.update(relationship)
@@ -136,7 +136,7 @@ def test_relationship_tool_belt(workflow_context, executor, 
dataholder):
                 relationship,
                 interface_name=interface_name,
                 operation_name=operation_name,
-                inputs=inputs
+                inputs=arguments
             )
         )
 

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/8fe7f4b1/tests/orchestrator/execution_plugin/test_local.py
----------------------------------------------------------------------
diff --git a/tests/orchestrator/execution_plugin/test_local.py 
b/tests/orchestrator/execution_plugin/test_local.py
index d9115e1..0dfd512 100644
--- a/tests/orchestrator/execution_plugin/test_local.py
+++ b/tests/orchestrator/execution_plugin/test_local.py
@@ -463,7 +463,7 @@ if __name__ == '__main__':
              inputs=None):
         local_script_path = script_path
         script_path = os.path.basename(local_script_path) if local_script_path 
else ''
-        inputs = inputs or {}
+        arguments = inputs or {}
         process = process or {}
         if script_path:
             workflow_context.resource.service.upload(
@@ -471,7 +471,7 @@ if __name__ == '__main__':
                 source=local_script_path,
                 path=script_path)
 
-        inputs.update({
+        arguments.update({
             'script_path': script_path,
             'process': process,
             'input_as_env_var': env_var
@@ -485,17 +485,17 @@ if __name__ == '__main__':
                 'test',
                 'op',
                 operation_kwargs=dict(
-                    implementation='{0}.{1}'.format(
+                    function='{0}.{1}'.format(
                         operations.__name__,
                         operations.run_script_locally.__name__),
-                    inputs=inputs)
+                    arguments=arguments)
             )
             node.interfaces[interface.name] = interface
             graph.add_tasks(api.task.OperationTask(
                 node,
                 interface_name='test',
                 operation_name='op',
-                inputs=inputs))
+                inputs=arguments))
             return graph
         tasks_graph = mock_workflow(ctx=workflow_context)  # pylint: 
disable=no-value-for-parameter
         eng = engine.Engine(

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/8fe7f4b1/tests/orchestrator/execution_plugin/test_ssh.py
----------------------------------------------------------------------
diff --git a/tests/orchestrator/execution_plugin/test_ssh.py 
b/tests/orchestrator/execution_plugin/test_ssh.py
index 92d250e..a369f8f 100644
--- a/tests/orchestrator/execution_plugin/test_ssh.py
+++ b/tests/orchestrator/execution_plugin/test_ssh.py
@@ -217,7 +217,7 @@ class TestWithActualSSHServer(object):
         @workflow
         def mock_workflow(ctx, graph):
             node = ctx.model.node.get_by_name(mock.models.DEPENDENCY_NODE_NAME)
-            inputs = {
+            arguments = {
                 'script_path': script_path,
                 'fabric_env': _FABRIC_ENV,
                 'process': process,
@@ -226,24 +226,24 @@ class TestWithActualSSHServer(object):
                 'test_operation': '',
             }
             if hide_output:
-                inputs['hide_output'] = hide_output
+                arguments['hide_output'] = hide_output
             if commands:
-                inputs['commands'] = commands
+                arguments['commands'] = commands
             interface = mock.models.create_interface(
                 node.service,
                 'test',
                 'op',
                 operation_kwargs=dict(
-                    implementation='{0}.{1}'.format(
+                    function='{0}.{1}'.format(
                         operations.__name__,
                         operation.__name__),
-                    inputs=inputs)
+                    arguments=arguments)
             )
             node.interfaces[interface.name] = interface
 
             ops = []
             for test_operation in test_operations:
-                op_inputs = inputs.copy()
+                op_inputs = arguments.copy()
                 op_inputs['test_operation'] = test_operation
                 ops.append(api.task.OperationTask(
                     node,

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/8fe7f4b1/tests/orchestrator/test_workflow_runner.py
----------------------------------------------------------------------
diff --git a/tests/orchestrator/test_workflow_runner.py 
b/tests/orchestrator/test_workflow_runner.py
index 7374e50..405cb80 100644
--- a/tests/orchestrator/test_workflow_runner.py
+++ b/tests/orchestrator/test_workflow_runner.py
@@ -190,7 +190,7 @@ def test_execution_inputs_override_workflow_inputs(request):
 def test_execution_inputs_undeclared_inputs(request):
     mock_workflow = _setup_mock_workflow_in_service(request)
 
-    with pytest.raises(modeling_exceptions.UndeclaredInputsException):
+    with pytest.raises(modeling_exceptions.UndeclaredParametersException):
         _create_workflow_runner(request, mock_workflow, 
inputs={'undeclared_input': 'value'})
 
 
@@ -198,7 +198,7 @@ def test_execution_inputs_missing_required_inputs(request):
     mock_workflow = _setup_mock_workflow_in_service(
         request, inputs={'required_input': 
models.Parameter.wrap('required_input', value=None)})
 
-    with pytest.raises(modeling_exceptions.MissingRequiredInputsException):
+    with pytest.raises(modeling_exceptions.MissingRequiredParametersException):
         _create_workflow_runner(request, mock_workflow, inputs={})
 
 
@@ -206,13 +206,13 @@ def test_execution_inputs_wrong_type_inputs(request):
     mock_workflow = _setup_mock_workflow_in_service(
         request, inputs={'input': models.Parameter.wrap('input', 'value')})
 
-    with pytest.raises(modeling_exceptions.InputsOfWrongTypeException):
+    with pytest.raises(modeling_exceptions.ParametersOfWrongTypeException):
         _create_workflow_runner(request, mock_workflow, inputs={'input': 5})
 
 
 def test_execution_inputs_builtin_workflow_with_inputs(request):
     # built-in workflows don't have inputs
-    with pytest.raises(modeling_exceptions.UndeclaredInputsException):
+    with pytest.raises(modeling_exceptions.UndeclaredParametersException):
         _create_workflow_runner(request, 'install', 
inputs={'undeclared_input': 'value'})
 
 

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/8fe7f4b1/tests/orchestrator/workflows/api/test_task.py
----------------------------------------------------------------------
diff --git a/tests/orchestrator/workflows/api/test_task.py 
b/tests/orchestrator/workflows/api/test_task.py
index 642c785..d57e424 100644
--- a/tests/orchestrator/workflows/api/test_task.py
+++ b/tests/orchestrator/workflows/api/test_task.py
@@ -44,15 +44,15 @@ class TestOperationTask(object):
         plugin = mock.models.create_plugin('test_plugin', '0.1')
         ctx.model.node.update(plugin)
 
-        inputs = {'test_input': True}
+        arguments = {'test_input': True}
 
         interface = mock.models.create_interface(
             ctx.service,
             interface_name,
             operation_name,
             operation_kwargs=dict(plugin=plugin,
-                                  implementation='op_path',
-                                  inputs=inputs),)
+                                  function='op_path',
+                                  arguments=arguments),)
 
         node = ctx.model.node.get_by_name(mock.models.DEPENDENT_NODE_NAME)
         node.interfaces[interface_name] = interface
@@ -66,7 +66,7 @@ class TestOperationTask(object):
                 node,
                 interface_name=interface_name,
                 operation_name=operation_name,
-                inputs=inputs,
+                inputs=arguments,
                 max_attempts=max_attempts,
                 retry_interval=retry_interval,
                 ignore_failure=ignore_failure)
@@ -92,15 +92,15 @@ class TestOperationTask(object):
         plugin = mock.models.create_plugin('test_plugin', '0.1')
         ctx.model.plugin.update(plugin)
 
-        inputs = {'test_input': True}
+        arguments = {'test_input': True}
 
         interface = mock.models.create_interface(
             ctx.service,
             interface_name,
             operation_name,
             operation_kwargs=dict(plugin=plugin,
-                                  implementation='op_path',
-                                  inputs=inputs)
+                                  function='op_path',
+                                  arguments=arguments)
         )
 
         relationship = ctx.model.relationship.list()[0]
@@ -113,7 +113,7 @@ class TestOperationTask(object):
                 relationship,
                 interface_name=interface_name,
                 operation_name=operation_name,
-                inputs=inputs,
+                inputs=arguments,
                 max_attempts=max_attempts,
                 retry_interval=retry_interval)
 
@@ -137,15 +137,15 @@ class TestOperationTask(object):
         plugin = mock.models.create_plugin('test_plugin', '0.1')
         ctx.model.node.update(plugin)
 
-        inputs = {'test_input': True}
+        arguments = {'test_input': True}
 
         interface = mock.models.create_interface(
             ctx.service,
             interface_name,
             operation_name,
             operation_kwargs=dict(plugin=plugin,
-                                  implementation='op_path',
-                                  inputs=inputs)
+                                  function='op_path',
+                                  arguments=arguments)
         )
 
         relationship = ctx.model.relationship.list()[0]
@@ -158,7 +158,7 @@ class TestOperationTask(object):
                 relationship,
                 interface_name=interface_name,
                 operation_name=operation_name,
-                inputs=inputs,
+                inputs=arguments,
                 max_attempts=max_attempts,
                 retry_interval=retry_interval)
 
@@ -189,7 +189,7 @@ class TestOperationTask(object):
             interface_name,
             operation_name,
             operation_kwargs=dict(plugin=plugin,
-                                  implementation='op_path'))
+                                  function='op_path'))
         dependency_node.interfaces[interface_name] = interface
 
         with context.workflow.current.push(ctx):

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/8fe7f4b1/tests/orchestrator/workflows/builtin/test_execute_operation.py
----------------------------------------------------------------------
diff --git a/tests/orchestrator/workflows/builtin/test_execute_operation.py 
b/tests/orchestrator/workflows/builtin/test_execute_operation.py
index 4cddbe6..88818ca 100644
--- a/tests/orchestrator/workflows/builtin/test_execute_operation.py
+++ b/tests/orchestrator/workflows/builtin/test_execute_operation.py
@@ -35,7 +35,7 @@ def test_execute_operation(ctx):
         ctx.service,
         interface_name,
         operation_name,
-        operation_kwargs={'implementation': 'test'}
+        operation_kwargs=dict(function='test')
     )
     node.interfaces[interface.name] = interface
     ctx.model.node.update(node)

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/8fe7f4b1/tests/orchestrator/workflows/core/test_engine.py
----------------------------------------------------------------------
diff --git a/tests/orchestrator/workflows/core/test_engine.py 
b/tests/orchestrator/workflows/core/test_engine.py
index 8c0705b..43ec9f1 100644
--- a/tests/orchestrator/workflows/core/test_engine.py
+++ b/tests/orchestrator/workflows/core/test_engine.py
@@ -63,11 +63,11 @@ class BaseTest(object):
             ignore_failure=None):
         node = ctx.model.node.get_by_name(mock.models.DEPENDENCY_NODE_NAME)
         interface_name = 'aria.interfaces.lifecycle'
-        operation_kwargs = dict(implementation='{name}.{func.__name__}'.format(
+        operation_kwargs = dict(function='{name}.{func.__name__}'.format(
             name=__name__, func=func))
         if inputs:
-            # the operation has to declare the inputs before those may be 
passed
-            operation_kwargs['inputs'] = inputs
+            # the operation has to declare the arguments before those may be 
passed
+            operation_kwargs['arguments'] = inputs
         operation_name = 'create'
         interface = mock.models.create_interface(node.service, interface_name, 
operation_name,
                                                  
operation_kwargs=operation_kwargs)

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/8fe7f4b1/tests/orchestrator/workflows/core/test_events.py
----------------------------------------------------------------------
diff --git a/tests/orchestrator/workflows/core/test_events.py 
b/tests/orchestrator/workflows/core/test_events.py
index 184071d..6d542e9 100644
--- a/tests/orchestrator/workflows/core/test_events.py
+++ b/tests/orchestrator/workflows/core/test_events.py
@@ -110,8 +110,7 @@ def run_operation_on_node(ctx, op_name, interface_name):
         service=node.service,
         interface_name=interface_name,
         operation_name=op_name,
-        
operation_kwargs=dict(implementation='{name}.{func.__name__}'.format(name=__name__,
-                                                                             
func=func)))
+        
operation_kwargs=dict(function='{name}.{func.__name__}'.format(name=__name__, 
func=func)))
     node.interfaces[interface.name] = interface
 
     eng = engine.Engine(executor=ThreadExecutor(),

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/8fe7f4b1/tests/orchestrator/workflows/core/test_task.py
----------------------------------------------------------------------
diff --git a/tests/orchestrator/workflows/core/test_task.py 
b/tests/orchestrator/workflows/core/test_task.py
index e488933..1ba6422 100644
--- a/tests/orchestrator/workflows/core/test_task.py
+++ b/tests/orchestrator/workflows/core/test_task.py
@@ -43,7 +43,7 @@ def ctx(tmpdir):
         relationship.source_node.service,
         RELATIONSHIP_INTERFACE_NAME,
         RELATIONSHIP_OPERATION_NAME,
-        operation_kwargs={'implementation': 'test'}
+        operation_kwargs=dict(function='test')
     )
     relationship.interfaces[interface.name] = interface
     context.model.relationship.update(relationship)
@@ -53,7 +53,7 @@ def ctx(tmpdir):
         node.service,
         NODE_INTERFACE_NAME,
         NODE_OPERATION_NAME,
-        operation_kwargs={'implementation': 'test'}
+        operation_kwargs=dict(function='test')
     )
     node.interfaces[interface.name] = interface
     context.model.node.update(node)
@@ -92,7 +92,7 @@ class TestOperationTask(object):
             node.service,
             NODE_INTERFACE_NAME,
             NODE_OPERATION_NAME,
-            operation_kwargs=dict(plugin=storage_plugin, implementation='test')
+            operation_kwargs=dict(plugin=storage_plugin, function='test')
         )
         node.interfaces[interface.name] = interface
         ctx.model.node.update(node)

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/8fe7f4b1/tests/orchestrator/workflows/core/test_task_graph_into_execution_graph.py
----------------------------------------------------------------------
diff --git 
a/tests/orchestrator/workflows/core/test_task_graph_into_execution_graph.py 
b/tests/orchestrator/workflows/core/test_task_graph_into_execution_graph.py
index 2a96d01..1633d4a 100644
--- a/tests/orchestrator/workflows/core/test_task_graph_into_execution_graph.py
+++ b/tests/orchestrator/workflows/core/test_task_graph_into_execution_graph.py
@@ -32,7 +32,7 @@ def test_task_graph_into_execution_graph(tmpdir):
         node.service,
         interface_name,
         operation_name,
-        operation_kwargs={'implementation': 'test'}
+        operation_kwargs=dict(function='test')
     )
     node.interfaces[interface.name] = interface
     task_context.model.node.update(node)

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/8fe7f4b1/tests/orchestrator/workflows/executor/test_process_executor_concurrent_modifications.py
----------------------------------------------------------------------
diff --git 
a/tests/orchestrator/workflows/executor/test_process_executor_concurrent_modifications.py
 
b/tests/orchestrator/workflows/executor/test_process_executor_concurrent_modifications.py
index 92f0fc4..8c3f72a 100644
--- 
a/tests/orchestrator/workflows/executor/test_process_executor_concurrent_modifications.py
+++ 
b/tests/orchestrator/workflows/executor/test_process_executor_concurrent_modifications.py
@@ -67,7 +67,7 @@ def _test(context, executor, lock_files, func, dataholder, 
expected_failure):
     key = 'key'
     first_value = 'value1'
     second_value = 'value2'
-    inputs = {
+    arguments = {
         'lock_files': lock_files,
         'key': key,
         'first_value': first_value,
@@ -80,8 +80,8 @@ def _test(context, executor, lock_files, func, dataholder, 
expected_failure):
         node.service,
         interface_name,
         operation_name,
-        operation_kwargs=dict(implementation='{0}.{1}'.format(__name__, 
func.__name__),
-                              inputs=inputs)
+        operation_kwargs=dict(function='{0}.{1}'.format(__name__, 
func.__name__),
+                              arguments=arguments)
     )
     node.interfaces[interface.name] = interface
     context.model.node.update(node)
@@ -93,12 +93,12 @@ def _test(context, executor, lock_files, func, dataholder, 
expected_failure):
                 node,
                 interface_name=interface_name,
                 operation_name=operation_name,
-                inputs=inputs),
+                inputs=arguments),
             api.task.OperationTask(
                 node,
                 interface_name=interface_name,
                 operation_name=operation_name,
-                inputs=inputs)
+                inputs=arguments)
         )
 
     signal = events.on_failure_task_signal

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/8fe7f4b1/tests/orchestrator/workflows/executor/test_process_executor_extension.py
----------------------------------------------------------------------
diff --git 
a/tests/orchestrator/workflows/executor/test_process_executor_extension.py 
b/tests/orchestrator/workflows/executor/test_process_executor_extension.py
index 30b23ed..acca0bf 100644
--- a/tests/orchestrator/workflows/executor/test_process_executor_extension.py
+++ b/tests/orchestrator/workflows/executor/test_process_executor_extension.py
@@ -27,7 +27,7 @@ from tests import storage
 
 
 def test_decorate_extension(context, executor):
-    inputs = {'input1': 1, 'input2': 2}
+    arguments = {'input1': 1, 'input2': 2}
 
     def get_node(ctx):
         return ctx.model.node.get_by_name(mock.models.DEPENDENCY_NODE_NAME)
@@ -41,24 +41,23 @@ def test_decorate_extension(context, executor):
             ctx.service,
             interface_name,
             operation_name,
-            operation_kwargs=dict(implementation='{0}.{1}'.format(__name__,
-                                                                  
_mock_operation.__name__),
-                                  inputs=inputs)
+            operation_kwargs=dict(function='{0}.{1}'.format(__name__, 
_mock_operation.__name__),
+                                  arguments=arguments)
         )
         node.interfaces[interface.name] = interface
         task = api.task.OperationTask(
             node,
             interface_name=interface_name,
             operation_name=operation_name,
-            inputs=inputs)
+            inputs=arguments)
         graph.add_tasks(task)
         return graph
     graph = mock_workflow(ctx=context)  # pylint: 
disable=no-value-for-parameter
     eng = engine.Engine(executor=executor, workflow_context=context, 
tasks_graph=graph)
     eng.execute()
     out = get_node(context).attributes.get('out').value
-    assert out['wrapper_inputs'] == inputs
-    assert out['function_inputs'] == inputs
+    assert out['wrapper_inputs'] == arguments
+    assert out['function_inputs'] == arguments
 
 
 @extension.process_executor

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/8fe7f4b1/tests/orchestrator/workflows/executor/test_process_executor_tracked_changes.py
----------------------------------------------------------------------
diff --git 
a/tests/orchestrator/workflows/executor/test_process_executor_tracked_changes.py
 
b/tests/orchestrator/workflows/executor/test_process_executor_tracked_changes.py
index 2b628a0..c766fe4 100644
--- 
a/tests/orchestrator/workflows/executor/test_process_executor_tracked_changes.py
+++ 
b/tests/orchestrator/workflows/executor/test_process_executor_tracked_changes.py
@@ -88,20 +88,20 @@ def _run_workflow(context, executor, op_func, inputs=None):
         node = ctx.model.node.get_by_name(mock.models.DEPENDENCY_NODE_NAME)
         interface_name = 'test_interface'
         operation_name = 'operation'
-        wf_inputs = inputs or {}
+        wf_arguments = inputs or {}
         interface = mock.models.create_interface(
             ctx.service,
             interface_name,
             operation_name,
-            operation_kwargs=dict(implementation=_operation_mapping(op_func),
-                                  inputs=wf_inputs)
+            operation_kwargs=dict(function=_operation_mapping(op_func),
+                                  arguments=wf_arguments)
         )
         node.interfaces[interface.name] = interface
         task = api.task.OperationTask(
             node,
             interface_name=interface_name,
             operation_name=operation_name,
-            inputs=wf_inputs)
+            inputs=wf_arguments)
         graph.add_tasks(task)
         return graph
     graph = mock_workflow(ctx=context)  # pylint: 
disable=no-value-for-parameter

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/8fe7f4b1/tests/resources/service-templates/tosca-simple-1.0/node-cellar/node-cellar.yaml
----------------------------------------------------------------------
diff --git 
a/tests/resources/service-templates/tosca-simple-1.0/node-cellar/node-cellar.yaml
 
b/tests/resources/service-templates/tosca-simple-1.0/node-cellar/node-cellar.yaml
index 8e80640..ee9e094 100644
--- 
a/tests/resources/service-templates/tosca-simple-1.0/node-cellar/node-cellar.yaml
+++ 
b/tests/resources/service-templates/tosca-simple-1.0/node-cellar/node-cellar.yaml
@@ -104,6 +104,16 @@ topology_template:
         Maintenance:
           enable: juju > charm.maintenance_on
           disable: juju > charm.maintenance_off
+        Standard:
+          create:
+            implementation:
+              primary: create_node_cellar.sh
+              dependencies:
+                - "process.args.1 > { get_attribute: [ SELF, tosca_id ] }"
+                - "process.args.2 > { get_property: [ HOST, flavor_name ] }"
+                - ssh.user > admin
+                - ssh.password > '1234'
+                - ssh.use_sudo > true
       requirements:
         - database: node_cellar_database
       capabilities:
@@ -161,16 +171,7 @@ topology_template:
             relationship:
               interfaces:
                 Configure:
-                  target_changed:
-                    implementation:
-                      primary: changed.sh
-                      dependencies:
-                        #- { concat: [ process.args.1 >, mongodb ] }
-                        - process.args.1 > mongodb
-                        - process.args.2 > host
-                        - ssh.user > admin
-                        - ssh.password > 1234
-                        - ssh.use_sudo > true
+                  target_changed: changed.sh
 
     nginx:
       type: nginx.Nginx
@@ -251,6 +252,7 @@ topology_template:
         Standard:
           inputs:
             openstack_credential: { get_input: openstack_credential }
+          create: create_data_volume.sh
 
   groups:
   
@@ -309,7 +311,7 @@ policy_types:
       client connections cleanly and shut down services. 
     derived_from: aria.Workflow
     properties:
-      implementation:
+      function:
         type: string
         default: workflows.maintenance
       enabled:

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