Abstract
This paper provides a view on classifying methods and tools for human-centered design (HCD). It introduces Newell and Card's table on the time scales of human action as a classifier of methods and tools. As an example, it assigns the use of guidelines and design principles to the social and organizational domain, the use of scenarios to the bounded rationality domain, and Hick's law and Fitts' law to the psychology domain of the time scales of human action.
