Although there are many activities (e.g., transition services), derived from correlational research, that occur while students are in school that increase the likelihood of positive post-school outcomes, many teachers continue to provide services shown to have little to no effect on outcomes of students with disabilities. The purpose of this study was to operationally define the predictors of post-school success for educators to understand what is necessary to develop, implement, and evaluate secondary transition programs based on predictor research. Results conclude experts in the field reached consensus on an operational definition and set of essential program characteristics for each predictor of post-school success to aid practitioners in implementing these practices.