My guess (and some based from my own experience), is that it supports the way a lot of non-technical clinicians like to organize the process: 1) what I want, 2) what I must avoid.
[VK] That's a great insight and should probably guide the design of the information system when it comes to displaying results, etc. Would have impact on a user interface, especially if we try to look at the faceted search metaphor which Eric was talking about. May be the user interface could be designed into two parts: What I want What I avoid.. Maybe this would be something that would be out of scope for this particular activity but we could look at it as a follow on activity Cheers, ---Vipul The information transmitted in this electronic communication is intended only for the person or entity to whom it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you received this information in error, please contact the Compliance HelpLine at 800-856-1983 and properly dispose of this information.