Teaching staff represent a powerful influence on program development. Therefore it is essential that their opinions be ascertained and analyzed in a school evaluation. The Teacher Opinion Inventory was developed to accomplish three goals: (1) to assess teacher opinion toward many facets of the school; (2) to provide teacher recommendations for improvement; and (3) to provide decision-making data relative to program development, policy formation, administrative organization, faculty development, and community relations. Part A of the inventory consists of 64 multiple-choice items which deal with organization and administration; curriculum and instruction; student discipline, counseling, and advisement; school/community relations; and job satisfaction. Part B consists of five open-ended questions soliciting suggestions for school improvement. This manual includes a description of the development of the inventory: instructions for its administration, scoring, and interpretation; and reliability and validity data. The entire text of the inventory is included. (BW)