User-Centered Design

3 Sep 2011 /

Design should:

  • Make it easy to determine what actions are possible at any moment (make use of constraints).
  • Make things visible, including the conceptual model of the system, the alternative actions, and the results of actions.
  • Make it easy to evaluate the state of the system.
  • Follow natural mappings between intentions and the required actions; between actions and the resulting effect; and between the information that is visible and the interpretation of the system state.

In other words, make sure that (1) the user can figure out what to do, and (2) the user can tell what is going on.

— Donald Norman, The Design of Everyday Things

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