Potential performance theory (PPT): Describing a methodology for analyzing task performance

Abstract

Based on potential performance theory (PPT), a methodological paradigm is developed that allows for individual-level analyses. The proposed methodology distinguishes among observed performance, strategy, and consistency, with the idea that changes in observed performance can be caused by changes in strategy or consistency. Equations are presented that allow the computation of strategy and consistency scores for groups and individuals, with the goal of enabling researchers to find the reasons why performance improves or does not improve. More specifically, people may (1) develop better strategies, (2) use them more consistently, (3) both, or (4) neither. It is even possible to have strategy-consistency trade-offs, as individuals focus on one at the expense of the other. Data obtained from an experiment illustrate these possibilities. © 2009 The Psychonomic Society, Inc.