Why is program evaluation important after a government policy is adopted?

Program evaluation is essential after a government policy is adopted to ensure that the policy effectively addresses the problems it was designed to solve and to justify the expenditure of public resources. Because it is often difficult to determine if a policy—rather than external factors—is responsible for a desired change, evaluation is necessary to confirm the policy's impact.12

In the context of public administration, program evaluation serves several critical functions:

• Performance Measurement: Modern public management emphasizes output and performance. Evaluation uses indicators, benchmarks, and targets to assess whether public services are being delivered effectively.3
• Resource Allocation: Evaluation allows governments to apply the economics of choice to decision-making. By analyzing specific outputs, officials can determine if resources are being used efficiently or if programs require revision.2
• Flexibility and Adaptation: Government programs often operate under pervasive uncertainty. Frequent evaluation allows for the revision of programs in light of unfolding circumstances, preventing commitment to designs that prove inappropriate.2
• Accountability: Evaluation acts as a mechanism to ensure that public officials and institutions remain responsive to the public interest and are held answerable for their performance.3