Problem solving as Representation
"Solving a problem simply means representing it so as to make the solution transparent" - Herbert Simon
Design by 0 working memory - meaning that don´t make a user to memorize stuff.
A good representation shows all the relevant information, and nothing else. Should enable: comparison, exploration, problem solving.
If designing a system to replace a manual work, pay attention not only at the process itself but also the objects used. for example by doctor your record tells more then only information written to it. If it is really "used" then you know a lot of action has been going on. If your record is still on doctors table then you were recently there etc.
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