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Development and validation of the forms of self-criticizing / attacking and self-reassuring scale - Short form.Sommers-Spijkerman, Marion; Trompetter, Hester; ten Klooster, Peter; Schreurs, Karlein; Gilbert, Paul; Bohlmeijer, Ernst; University of Twente; University of Derby (American Psychological Association, 2017-08-10)Studies investigating the effectiveness of compassion-focused therapy (CFT) are growing rapidly. As CFT is oriented toward helping people deal with internal processes of self-to-self-relating, having instruments to measure these processes is important. The 22-item Forms of Self-Criticizing/Attacking and Self-Reassuring Scale (FSCRS) has been found a useful measure. In the present study, a 14-item short form of the FSCRS (FSCRS-SF) suited to studies requiring brief measures was developed and tested in a Dutch community sample (N = 363), and cross-validated in a sample consisting of participants in a study on the effectiveness of a guided self-help compassion training (N = 243). Confirmatory factor analysis (CFA) indicated acceptable to good fit of the FSCRS-SF items to a three-factor model. Findings regarding internal consistency were inconsistent, with Study 1 showing adequate internal consistency for all subscale scores and Study 2 demonstrating satisfactory internal consistency only for the reassured self (RS) subscale score. Furthermore, the results showed that the FSCRS-SF subscale scores had adequate test–retest reliability and satisfactory convergent validity estimates with theoretically related constructs. In addition, the FSCRS-SF subscale scores were found to be sensitive to changes in self-to-self relating over time. Despite mixed findings regarding its reliability requiring further investigation, the FSCRS-SF offers a valid and sensitive measure which shows promise as a complimentary shorter version to the original FSCRS suited to nonclinical populations. Given that the FSCRS is increasingly used as a process and outcome measure, further research on this short form in nonclinical and clinical populations is warranted.