Implementing a multi-tiered system of support (MTSS) to promote positive student outcomes requires data collection on the delivery of intervention with fidelity and the student’s response to instruction and interventions. Similarly, when schools adopt a school-wide or department-wide approach related to a content area (e.g., literacy, behavior), data collection on the implementation of the intervention or curriculum with fidelity and the effects of the approach or curriculum on student outcomes is essential. In this fact sheet, we provide guidance on data that should be gathered and used by school leaders for decisions related to implementing the Pyramid Model for Promoting the Social and Emotional Competence of Young Children (Pyramid Model). (author abstract)