" Tip: make wireframes or mock-ups of the various screens and draw the navigation (the flow) between those wireframes. He called it a wireflow.
Apparently designing interfaces by Jenifer Tidwell is “the bible” for stuff like this.
When designing, use four Gestalt principles: proximity, similarity, continuity and closure. (The page linked has five items, btw).
And keep in mind that too many choices mean that a task takes too much time (Hick’s law), so don’t put in too many choices.
" -- http://reinout.vanrees.org/weblog/2013/11/18/ui-ux-course.html
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" What I really liked about the course was the use of paper prototypes and scenarios.
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Paper prototypes
The second thing Tom mentioned to be very cheap was a paper prototype instead of creating a whole HTML mockup.