A proposed method for measuring change beyond symptoms.

The initial report of the Patterns of Individual Change Scales battery presented the rationale, development, and conceptualization of this measurement package. Empirical data supported the reliability and validity of the scales as measures of patient characteristics that extended beyond the symptomatic domain. This article presents more extensive reliability and validity data. Ratings on two new samples were collected, and the interrater reliability coefficients for the scales were again of appreciable magnitude. Discriminant validity was examined, as was the factor structure of the battery. The results suggested that the scales tap three distinct sources of variance. Comparisons with symptom measures and case illustrations indicated that the measurement of changes in patients' functioning beyond symptoms is necessary and viable.