Confirmatory Factor and Rasch Analyses Support a Revised 14-Item Version of the Organizational, Policies, and Practices (OPP) ScaleShi, Q., MacDermid, J., Tang, K., Sinden, K., Walton, D., & Grewal, R. (2017). Confirmatory factor and rasch analyses support a revised 14-Item version of the organizational, policies, and practices (OPP) scale. Journal of Occupational Rehabilitation, 27(2), 258–267.