This second article of the special section on chaos theory addresses implications of the definition of chaotic behavior for its measurement. The requirements to test the presence of chaotic relations among variables are in agreement with the conceptual and methodological hallmarks of behavioral assessment. (SLD)

This introduction to a special section provides the basic definitions and presents the measurement approaches and data analytic techniques that are collectively referred to as chaos theory. The conceptualization and assessment of unstable behavioral disorders can be strengthened by incorporating elements of chaos theory. (SLD)

This study examines the relationship between three variables in the problem-solving approaches of emotionally disturbed children. The variables of locus of control, persistence behavior, and reflection-impulsivity were related to each other and to problem-solving approach. The varying nature of these relationships is discussed. (SJL)

Three levels of screening procedures were used to identify the incidence and nature of learning disabilities. The first level involved the application by classroom teachers of the Classroom Screening Instrument (CSI), especially developed for the study, and of other measures; the second level involved psychoeducational differential diagnosis by…