This paper describes an information system designed for data-based decision making by a state vocational education agency in prioritizing courses for instructional materials development or acquisition. This needs assessment system is the second part of a project which focused attention on the need for competency-based instruction. The information system is described as follows. A survey instrument, administered statewide to teachers in selected vocational courses, is used to measure the quality of materials currently in use in terms of discrepancy-from-ideal (D). The importance (I) for each course of developing instructional materials is calculated as the weighted mean of several factors, such as number of students, placement statistics, job market prospects (demand), job earnings, cost category, and other factors. A priority index, the product of I times D, is used to rank order the courses. Appendixes in this document include the importance factor weighting instrument, a sample page from the instructional materials assessment survey (IMAS), an IMAS course/program information summary sheet, and a pair-comparison instrument. (Author/CSS)