Book excerpt: This module examines key aspects of monitoring and evaluation as they relate to a mental health policy and plan including how to monitor a plan and the different ways to evaluate a policy and plan. It presents a five-step process for conducting evaluations and explains how results of an evaluation can be utilized to improve policies and plans. The module then provides a detailed case study of a policy and plan of a hypothetical country. It describes various ways that evaluation can be used over a period of time to assess and influence policy and the plan that arises from it including the practical steps involved in policy evaluation and the policy decisions that can be made on the basis of monitoring and evaluations. Also available: 14-module package: WHO Mental Health Policy and Service Guidance Package - 14 modules Other modules included in the package: Improving Access and Use of Psychotropic Medicines Child and Adolescent Mental Health Policies and Plans Mental Health Policy Plans and Programmes. Updated version Mental Health Context Mental Health Financing Advocacy for Mental Health Quality Improvement for Mental Health Organization of Services for Mental Health Planning and Budgeting to Deliver Services for Mental Health Mental Health Legislation and Human Rights Mental Health Policies and Programmes in the Workplace Mental Health Information Systems Human Resources and Training in Mental Health Monitoring and Evaluation of Mental Health Policies and Plans