Donald Norman (1983b)
Four Stages of User Activities
In: Interact '84 Conference Papers, vol. 1, pp. 81-85, IFIP.
The interaction between a person and a computer system involves four different stages of activities—intention, selection, execution, and evaluation—each of which may occur at different levels of specification. Analysis of these stages and levels provides a useful way of looking at the issues of human-computer interaction.