After refining the Illinois Model for Occupational Teacher Internship, 20 practicing occupational teachers in public schools field tested the model to determine the nature and value of the concept of business/industry internships. Some major findings from data on intern evaluations revealed that (1) the internship provided an educationally meaningful experience, (2) understanding of their field was enhanced through learning about job attitudes and expectations, and experience with new equipment, (3) personnel at the work sites were willing and able to provide needed assistance, and (4) time to accomplish the internship was difficult to find. Evaluations from employers were positive, indicating that the interns sought out activities and were satisfied by their performance as professionals seeking to attain skills for later use in the classroom. It was concluded that the Illinois Model was acceptable in terms of transportability and diffusion. Suggestions and recommendations are made concerning teacher awareness of opportunities for internships in industry, and the part that schools and universities should play in such efforts. The appendixes contain various examples of forms and correspondence used in the study. (HD)