RecruitingBehavioural interventionImpact Trial of Helping Educational Leaders Mobilize EvidenceSocial, emotional, and behavioral (SEB) problems occur frequently among elementary school students, dramatically impede student outcomes, and have been exacerbated by the COVID-19 pandemic. Evidence based practices exist to address student SEB needs, prevent problems, and ensure academic success. However, the implementation of these programs in schools is frequently incomplete, uneven, and occurs with insufficient fidelity to ensure positive effects for students due to significant implementation barriers across multiple levels. The purpose of this Impact Trial is to test the effectiveness of the Helping Educational Leaders Mobilize Evidence (HELM) implementation strategy in school-wide implementation of a Tier 1 evidence-based practice (EBP) - Positive Behavioral Interventions and Supports (PBIS).