Fidelity is the extent to which the intervention, as realized, is “faithful” to the pre-stated model. Measuring implementation fidelity provides data for understanding the overall impact of the program at the teacher level, site level, and state level. This paper describes the tools used to measure implementation as well as lessons learned locally, across sites, and at the state level. #EvaluationUse #2010Conference #MixedMethodsEvaluation #Implementation_Fidelity #Instruments