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Research Article

Dimensions of supported employment: Factor structure of the IPS fidelity scale

Pages 383-393 | Published online: 06 Jul 2009
 

Abstract

The IPS Fidelity Scale is a 15-item instrument assessing the implementation of critical ingredients of the Individual Placement and Support model of supported employment for people with severe mental illness. An earlier study established adequate inter-rater reliability for this scale, based on interviews with vocational staff. The scale also differentiated between IPS programs and other types of vocational services. The current study examined the factor structure of the scale in a sample of 123 vocational programs throughout the US. Using principal components factor analysis with varimax rotations, we identified four factors: I. Job Selection, II: Integration with Treatment Team, III: Job Development, and IV: Vocational Staffing. Among the four factors, Integration with Treatment Team best differentiated IPS programs from other types of supported employment programs. This study further establishes the IPS Fidelity Scale as a useful measure for assessing IPS and other supported employment programs.

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