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A standard operator in a keystroke-level model (KLM), P represents the act of pointing, that is, moving a cursor with a mouse. It was empirically determined to average 1100 msec by Card, Moran, and Newell (1980b, 1983), but it can also be calculated with Fitts’ Law.
A design movement primarily associated with Scandinavia, in which future users of the artifacts being designed participate in the original design work.
Program Evaluation Review Technique, a methodology developed by the U.S. Navy in the 1950s to manage the Polaris submarine missile program. A similar methodology, the Critical Path Method (CPM), which was developed for project management in the private sector at about the same time, has become synonymous with PERT, so that the technique is known by any variation on the names: PERT, CPM, or PERT/CPM. These methods are used in cognitive modeling to depict the parallel operation of perceptual, cognitive, and motor operators, with resource allocation and information-flow constraints.
An example of an abstract formal model—that is, one that is used to analyze a class of systems and usability problems rather than specifying a particular system. The PIE model was developed at York University in the mid-1980s and was one of the first steps in a new stream of formal method work in human-computer interaction (HCI) that began at that time. See: http://www.hcibook.com/alan/topics/formal/
Something (a physical artifact, electronic record, or human memory) that explicitly or tacitly maintains the current position within a formal or informal process. See: http://www.hcibook.com/alan/topics/triggers/
a technique used during the design of interactive systems in which the designer adopts a computational perspective on the task objects in a scenario.
When being trained as a carpenter or a nurse, for example, one shares a practice. At the same time, each individual who possesses a practice keeps it up and changes it as well. It is practice that allows us to talk about more than just individual skills, knowledge, and judgment, and not just about a “generic” human being. Practice is shaped historically, which is of particular relevance for design and use of computer applications.
The rapid detection of visual features theorized to occur in parallel before the operation of selective attention.
A model that allows metrics of human performance to be determined analytically without undertaking time-consuming and resource-intensive experiments.
Problem Behavior Graph
A graphical depiction of search through a problem space.