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task analysis

Any process that identifies and examines tasks that must be performed, either by users, other agents, or the system itself, to accomplish the goals of an interactive system.

task-artifact cycle

All human artifacts both enable and constrain human activity. Human use of current artifacts thus suggests possibilities and requirements for the design of future artifacts, which in turn will ultimately both enable and constrain human activity.


An issue (often in design) that is understood to have competing arguments, usually positive and negative impacts of an option.

transfer of learning

A learning and memory phenomenon in which what is learned in one situation facilitates understanding and behavior in a similar situation.