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hci g

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A version of GOMS that is computationally realized in a tool called GLEAN. NGOMSL stands for Natural GOMS Language, and was developed by Kieras in the mid-1980s. More information can be found in Kieras (1997) and Kieras, et al. (1995).

nonfunctional requirements

Qualities of a system under development that are not directly related to its function, such as maintainability or reliability.

normative model

A model that identifies one or a few best ways for a system or person to behave. The model usually offers a criterion or criteria against which to evaluate behavior.


A system of symbols used in specialized fields to represent facts or values (as in a circuit diagram) or to give instructions (as in a programming language), usually subject to rules of combination and ordering (“syntax”). Although the symbols are discrete, there may be an admixture of analog features (relative placement of components in a circuit diagram, or layout of text in a program). This is a wider definition than that of Nelson Goodman’s (1968), for example, but it is more typical of conventional usage. Notations may be persistent (written down) or transient (spoken or otherwise fleeting). See also interaction language.