Greetings all from Sunny Spain!
I have just finished the first chapter.
I hope I'm replying in the right place, the signifier on my iPhone wasn't too clear on where to comment on this thread .
For me a few memories popped into my head.
The first being my grandad walking into my dads glass sliding door when I was younger, he knew the door sliding but used to get really angry with my dad asking him to add a sticker (signifier) so he could tell if the door was open or not.
When I read about mapping it made me think of my current house here in Spain, we have three light switches together and the one closest to the door should control the outside light. Annoyingly it's the one furthest away which does. To this day, I still get it wrong!
If an afforance is not perceived or signaled it is pretty much useless and no help to the user.
It's important that a users conceptual model is the same as the design/developers.
Realating to my work place.
We created an app which a user could log in using their finger print. However when I user tested it I found that when the user logged out and then tried to log in again with there finger print, the app asked the user to login with username and password.
When I contacted the developer he said this was because the user was "logging out" to user the finger print id and that they needed to just close the app.
I believe this is an example of the user and developer having different conceptual models.
Let me know you thoughts.