Each chapter of this yearbook is written by a different member of the writing committee, whose chairman, Horton C. Southworth, headed the Commission on Internships appointed in 1965 to study the teacher internship concept theoretically and report the nature of its implications across the nation. Part 1 on structure and strategies of internships includes 11 chapters: The Teacher Education Internship in Historical Perspective; A Conceptual Model of the Internship in Professional Training; Organizational Patterns: Experimentation and Research; Integration of Theory and Practice in Internship; Changing Teacher Behavior: Objective of Internship; The Supervision of Intern Teachers; Role Analysis Applied to Internship Processes; The Professional Components for Elementary School Intern Teachers; The Content of Internships: Student Experiences and Program Design in Secondary Programs; Resources for Internship; Developing Teacher Behavior in Clinical Settings. Part 2 reports results of the Commission's 1967 survey which revealed the existence of 51 internship programs functioning within the Commission's definition. Results of the questionnaire, sent to 733 members of the American Association of Colleges for Teacher Education, are reported, and summaries are presented of 13 representative programs and of interns' reactions to programs. Included is a 98-item annotated bibliography on Internships in Teacher Education. (JS)