It is, of course, assumed that these “behavioral objectives” have been clearly defined by the curriculum worker. They should have been defined clearly so as to provide a concrete guide in the selection and planning of learning experiences. If they have not yet been clearly defined, it is absolutely essential that they be defined in order to make an evaluation since unless there is some clear conception of the sour of behavior implied by the objectives, one has no way of telling what kind of behavior to look for in the students in order to see to what degree objectives are being realized. This means that the process of evaluation may force persons who have not previously clarified their objectives to further process of clarification. Definition of objectives, then, is an important step in evaluation.