Monitoring, Evaluation, Accountability and Learning (MEAL) comprises a growing strand within humanitarian action. The point is simple: comprehend and demonstrate the impact of humanitarian intervention. Does it work? A straightforward question that is difficult to answer given the complexities and constraints of the humanitarian operating environment. MEAL involves tracking the progress of programs, making adjustments and assessing the outcomes. Equally challenging is the use of this information to foster change within the organization or even the system as a whole.