Although indecisiveness seems to be a widespread problem, little empirical research has addressed its measurement. Frost and Shows (1993; Behaviour Research and Therapy, 31, 683-692) introduced the Indecisiveness Scale (IS) as a measure of individual differences in general indecisiveness. Although these authors conducted various psychometric analyses, some properties (e.g., factor structure, test-retest reliability) were not investigated. In the present studies, several reliability and validity indices were computed. First, four of the fifteen items of the IS were found to be omissible. Second, 4-week test-retest reliability was found to be satisfactory. Third, scores on the IS were found to correlate meaningfully with a concurrent measure of decision making, and with various scales of psychopathology. Lastly, in Study 4, the IS was found to predict scores on a behavioural measure of decision making, suggesting good predictive validity. Overall, these findings suggest that the IS has good psychometric properties.

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Journal of Psychopathology and Behavioral Assessment
Department of Psychology

Rassin, E.G.C, Muris, P.E.H.M, Franken, I.H.A, Smit, M, & Wong, M. (2007). Measuring general indecisiveness. Journal of Psychopathology and Behavioral Assessment, 29(1), 61–68. doi:10.1007/s10862-006-9023-z