A Rasch analysis was conducted to assess a rubric that measures the quality of school-level variables that support the implementation of a social and emotional learning (SEL) program. SEL planning teams from 84 schools rated the quality of school-level variables (e.g., principal support, available funds, and resources) that support the implementation of an SEL program in their schools. A Rasch analysis suggested that the rubric was a two-dimensional solution, Planning and Activity. Ratings were collected for 3 years. Cluster analysis demonstrated that there were five groups of schools with different trends in their implementation process. The analysis demonstrated that the rubric can be improved by revising items and writing additional items to measure the full range of implementation quality.