Wednesday, August 27, 2008

Principles of Usability

I have written earlier about intuitive uesr interfaces. In that article I argue that a large amount of human behavior is learnt and there is nothing intuitive about it. Hence we should drop the notion of intuitiveness when we design user interfaces. Instead we should design interfaces based on the principles of efficiency.

A user interface is more usable if it allows the user to accomplish the desired task:
  1. in minimum time possible
  2. with least effort. Effort can be measured in the following ways:
    1. Physical effort: clicking, typing etc
    2. Mental effort: a) Searching (less is good) b) Memorizing (less is good)
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