Wednesday, September 19, 2007

Usability principles


User Knowledge Principle:
Figure out who your user is, what they do, and what they need.
Feature Bloat Principle:
Recognize the cost of each feature you add and each exceptional use case you accommodate.
Focus Principle:
Good design requires editing. Focus the design on one principle class of users.
Abstraction Principle:
Keep track of the “conceptual model” your software requires, and work at making it simpler. Reduce cognitive friction.
Direct Manipulation Principle:
Enable the illusion of direct manipulation when there is a reasonable physical metaphor.

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