Project evaluation is the process of measuring the success of a project through gathering data and using evaluation methods. It allows identifying performance improvements and keeping stakeholders updated. Project evaluation criteria consider factors like time, cost, scope, and quality. There are various project evaluation methods including pre-project, ongoing, and post-project evaluation. Project appraisal involves a detailed evaluation of a project's political, social, environmental, technical, financial, and economic feasibility to determine its viability. It helps decide whether to accept or reject a project.