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Marc Hassenzahl explains the fascinating concept of User Experience and Experience Design. Commentaries by Don Norman, Eric Reiss, Mark Blythe, and Whitney Hess

User Experience and Experience Design !


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Vigilance, which is also known as sustained attention, is the ability to sustain attention during prolonged, monotonous tasks. In a traditional laboratory-based vigilance task, the participant must maintain continuous alertness and watchfully wait to detect a signal stimuli that appears at an unknown time. Real-world vigilance tasks include watching a radar screen for occasional unexpected blips, proofreading a text looking for spelling errors, remembering to check the speedometre at certain intervals to make sure we do not speed, etc.

Relevance for interaction design

A well-known usability principle states that designers should strive to put the user in control. The user, and not the system, should initiate and control actions. Vigilance tasks are however one area where it may be wise not to take the principle too literally. Humans are infamous for their poor performance on vigilance tasks, so it makes sense not to burden users with tasks such as reminding us of our appointments, auto-saving our word processor documents, etc.


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 what's this?

Eysenck, Michael W. and Keane, Mark T. (2000): Cognitive Psychology. A Student's Handbook. (Fourth edition). London, Psychology Press

Gentner, Donald R. and Nielsen, Jakob (1996): The Anti-Mac Interface. In Communications of the ACM, 8 pp. 70-82.

Sternberg, Robert J. (1996): Cognitive Psychology. 2nd. Ed.. Harcourt Brace College Publishers