A field test examined the validity of the "Interdisciplinary Cooperative Education Curriculum Manual." (Among those topics covered in the manual are the following: vocational student organizations, leadership, civic responsibility, health and safety, human relations, communications, resource management, consumer skills, consumer law, career planning, job search strategies, and arithmetic.) Twenty-six Oklahoma vocational, agriculture, and home economics teachers submitted between one and no units each (a total of 116 units), representing the work of 590 students. In addition, instructors provided comments on the units and suggested changes in them. Item analyses were made on the tests, including frequency counts of the number of correct answers and the percentage of students having a correct answer on a given item. Identification was made of those concepts on which 20 percent or more of the students were not achieving. Because over one-half of the units fell below the arbitrarily set standard of 80 percent, the manual warrants further study to determine what weaknesses exist--whether in the presentation of the concepts as written or as taught or in the students' inability to comprehend the more abstract concepts. (Teacher comments on the manual and item-by-item test results are included.) (MN)