Abstract
This article is the first in a special section on chaos theory and psychological assessment. This introductory article provides the basic definitions, measurement approaches, and data analytic techniques that are collectively referred to as chaos theory (T. Y. Li & J. A. Yorke, 1975). Chaos refers to certain unstable transitional phenomena that heretofore had been viewed as random (S. Krasner, 1990). Some have suggested that unstable human behavior of interest to psychological assessment may be chaotic, such as some extreme mood changes (L. Glass & M. C. Mackey, 1988). Chaos theory testing involves quantification of idiographic time series data with nonlinear dynamic mathematical modeling. Chaotic behavior exhibits abrupt changes in the parametric values of variables that are an iterative function of past values, yielding an irreversible and hierarchical pattern
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