The Probability of the Adoption of Change (PAC) model (Creamer & Creamer, 1986a, 1986b, 1988, 1989, 1990; Creamer, Creamer, & Ford, 1991) is a planned change model consisting of nine constructs postulated to influence the success of planned change projects. The constructs in the model include circumstances, value compatibility, idea comprehensibility, practicality, superintendency, championship, advantage probability, strategies, and opposition. The PAC model was tested in the context of curriculum revitalization in undergraduate agriculture and life sciences programs.

Faculty and administrators from colleges and departments of agriculture and life sciences throughout the United States responded to survey items written to measure the relationship of the PAC model constructs with the success of curriculum revita1ization projects with which they, the respondents, had been involved. Participants also responded to items written to assess their perceptions of the success of the projects.