Abstract
The following major rules of evaluation should be observed by the modern public health worker: (1) The practical objectives of each program to be evaluated should be clearly stated. (2) The underlying assumptions of validity associated with each objective should be meticulously identified. (3) Evaluations by effort should always be done. Evaluations by performance, and efficiency should be done whenever possible. (4) The entire program should be reexamined in the light of the findings arising from the evaluation exercise. (5) To insure the reliability of any standards developed as aids to evaluation, the status of all significant conditions associated with the use of the standard must be specified. (6) The ultimate value of evaluation to public health programs will depend to a great extent upon research proof of the validity of the assumptions involved in the establishment of key objectives. (7) As in every new field there is a period of time set aside for claification of terms and construction of conceptual frameworks. Further progress will then occur only from the performance of actual evaluation projects, carefully designed and analyzed. Public health practitioners today need the stimulation which can be achieved only through the critical appraisal of a large number of such studies.

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