You're linking the concept of the back button to a state system in
photoshop where depending on what tool is active, shortcut keys / key
modifiers do completely different things.

Huh? What? That makes no sense at all - those things aren't even
remotely similar to each other!

On Nov 6, 8:47 am, Rob Ross <rob.r...@gmail.com> wrote:
> I assure you I understand the difference.
>
> see here:http://en.wikipedia.org/wiki/User_interface#Modalities_and_modes
>
> specifically
>
> "Heavy use of modes often reduces the usability of a user interface, as the 
> user must expend effort to remember current mode states, and switch between 
> mode states as necessary."
>
> also:
>
> http://en.wikipedia.org/wiki/Mode_(computer_interface)
>
> "An human-machine interface is modal with respect to a given gesture when (1) 
> the current state of the interface is not the user's locus of attention and 
> (2) the interface will execute one among several different responses to the 
> gesture, depending on the system's current state." (Page 42)." - Jeff Raskin
>
> Rob
>
> On Nov 6, 2010, at 12:37 AM, Cédric Beust ♔ wrote:
>
>
>
>
>
>
>
>
>
> > On Fri, Nov 5, 2010 at 11:20 PM, Rob Ross <rob.r...@gmail.com> wrote:
>
> > > By the way, I think you are misusing the term "modality", which might be 
> > > why we seem to be in disagreement on this issue.
>
> > I'm using it in the simplest possible way to describe a human/computer 
> > interaction where the human has to keep a state model in his/her head as 
> > the software is used.
>
> > That's what I figured. The more traditional meaning of "modal" is something 
> > that forces you to act on it before you can resume other activities, such 
> > as a "modal dialog". They are sometimes necessary but by and large, modern 
> > applications are moving more to a "modeless" model where the actions you 
> > need to do are typically moved away from the main document so you can act 
> > on either any time you like.
>
> > You are probably more talking about "context", and again, my experience has 
> > shown that most users have no problems remembering a stack of three-four 
> > past activities (and if they make a mistake, they can always undo it by 
> > going "forward", which is another strength of this model).
>
> > The simplest example is something like Photoshop, where depending on your 
> > current mode (i.e., which tool is selected), clicking an object or using 
> > the keyboard can produce vastly different results.
>
> > A more modeless example would be a simple text editor.
>
> > Now that I read this, I think you are simply confusing "model" and "modal".
>
> > --
> > Cédric
>
> > --
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