A *(user interface) concept, *(acronym) for Goals, Operators, Methods and Selection rules, a model of efficiency in _(HCI).

From _("GOMS Models: An Approach to Rapid Usability Evaluation"|http://www.eecs.umich.edu/~kieras/goms.html):

<cite>[..] Earlier research in HCI has resulted in a general concept, the <strong>GOMS model</strong>, which represents the procedural knowledge required to operate a system in terms of the user <strong>G</strong>oals, basic actions or <strong>O</strong>perators, <strong>M</strong>ethods, which are sequences of operators that will accomplish goals, and <strong>S</strong>election rules, which determine which method to apply to accomplish a goal. [..]</cite>