Reviews of the transition literature have identified 23 in-school predictors of post-school success for students with disabilities. We sought to identify available variables in the National Longitudinal Transition Study 2012 (NLTS 2012) Phase I dataset that correspond with the 23 in-school predictors of post-school success to better understand transition experiences for students with disabilities. This report discusses the iterative review process we used to identify close matches for 11 predictors, weak matches for 6 predictors, and no match for 6 predictors. Implications for research are also discussed. [For the companion report, "Comparing Access to In-School Predictors of Post-School Success for Students with Intellectual Disability in Conventional and College-Based Transition Services. Think College Reports," see ED626991.]