Details of command-language keystrokes

Abstract

The Keystroke-Level Model asserts that the time for an expert to enter a task using a command language is a function of specific task-acquisition, mental, and motor-response times. The evidence for the model is critically reviewed, and new data are presented. The fit of the new data to the model is modest even when several modifications of the model are considered. It is proposed that a more complex model, based explicitly on cognitive processes, is necessary.