The Functional Idiographic Assessment Template-Questionnaire (FIAT-Q): Initial psychometric properties

•We created a measure (FIAT-Q) of interpersonal problems that are a focus of FAP.•The FIAT-Q is part of a larger system of assessment for interpersonal problems.•The measure has excellent psychometric properties and measures five factors.•The FIAT-Q evidences validity and sits in a context of evidence based assessment.•The FIAT-Q may have clinical utility for ACT or FAP therapists.

The evidence based assessment (EBA) movement stresses the importance of psychological measures with strong psychometric properties and clinical utility. The Functional Idiographic Assessment Template system (FIAT; Callaghan, 2006) is a functional analytic behavioral approach to the assessment of interpersonal functioning for use with therapies like Functional Analytic Psychotherapy (FAP; Kohlenberg & Tsai, 1991). While research has begun to demonstrate the clinical utility of the FIAT, its psychometric properties have not been explored. The present study examines the Functional Idiographic Assessment Template-Questionnaire (FIAT-Q), a self-report measure contained in the FIAT. Two different approaches are used to explore the psychometric properties and structure of the FIAT-Q, and test–retest reliability is examined. These methods are discussed along with the use of the FIAT-Q as an alternative to nosological assessment of client behaviors.