Following a review of over 350 evaluation-related reports as well as written evaluation activities by the National Advisory Council, state advisory councils, and over 30 state departments of education, three criteria were proposed as methods to be used by state education leaders in assessing the worth of an existing or proposed evaluation system. These criteria include determining: (1) the validity of the system or how accurately the data collected by the system reflects the true vocational education situation of the state, (2) the effects or impact of the information generated by a system on the local program, and (3) the cost of the system. These criteria are discussed along with techniques of evaluation, research priorities, and methods of implementing an evaluation system. (SB)