This study investigated how adult education teachers changed after participating in one of three different models of professional development (multisession workshop, mentor teacher group, or practitioner research group), all on the same topic of learner persistence. The study also investigated the most important individual, professional development, program, and system factors that influenced the type and amount of teacher change. This study was conducted primarily to help professional development decisionmakers plan and deliver effective professional development, and to understand the factors that influence how teachers change as a result of professional development.
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