"This knowledge brief aims to provide an overview of the IMM landscape in Nigeria and draws lessons from organizations who have IMM experience in West Africa. The knowledge brief focuses on providing an understanding of how impact is defined by some organizations, what elements they take into consideration when designing an IMM strategy, why they measure impact, the upsides and downsides of standardization, challenges they face in measuring and managing impact, and how they utilize data to drive impact. The knowledge brief also shares the IMM journey of three organizations: Aspire Coronation Trust (ACT) Foundation, LEAP Africa and MBC Africa, and provides recommendations on implementing IMM."