This document discusses the evaluation of policies and interventions in the public sector. It defines evaluation as the systematic assessment of a policy's design, implementation, and outcomes to determine if it achieved its intended results and costs. Effective evaluation requires collecting baseline data before implementation and ongoing monitoring data to assess the policy's impacts and feed back into the process. It also discusses using a theory of change to conceptually frame how a policy's activities are expected to lead to its intended outcomes and impacts. The goal of evaluation is to determine a policy's effectiveness and inform future decision-making.