Principles of Evaluation: A Manual, Directorate of Evaluation and Manpower Planning and Social Welfare Department, Government of Mysore, 1969; pp xi + 192, "PRINCIPLES of Evaluation: A Manual", brought out by the Government of Mysore, is an addition to the literature on plan evaluation. The object of the publication is to lay down guidelines for the functioning of the Directorate of Evaluation. The Working Group on Evaluation in the States had emphasised the need for a manual on evaluation and had recommended that the Programme Evaluation Organisation (PEO) should address itself to the task.