The state of the art of an educational entity which has served America since the early 18th century is presented in this study, which describes the origins and characteristics of the independent private or proprietary schools in Illinois. The word "industry" is used for these schools because they constitute a profit-seeking, tax-paying business which prospers or declines in proportion to achievement as with any business in the free enterprise system. The majority of such schools are occupationally oriented with courses designed to prepare students for job entry in some special phase of the world of work. The primary operational activities of these schools are resident, home study, and extension. The various kinds of independent private schools and the principal courses taught by them are described for areas of specialization in business, trade and technical, art, allied health services, self improvement, home study, barber and cosmetology, truck driving and heavy equipment operation, and aviation. Further development of the educational area and additional study needs are suggested. The study concludes with a directory of the various categories of approved and licensed independent private schools in Illinois. (MF)