Understand the critical difference between mitigation and acceleration in construction scheduling and why terminology can affect delay analysis, recovery programmes, cost responsibility, and contractual entitlement. This article explains how mitigation typically involves reasonable steps to reduce delay impacts, while acceleration may require additional labour, overtime, equipment, or shifts to recover time. It also explores how planners, contract managers, and project controls professionals should frame Primavera P6 updates, schedule narratives, and client instructions to protect entitlement and support defensible delay claims.