Selected for their influence on the field, their continued reference over the years, and the reputation of the authors, this collection includes 17 seminal works in educational technology. These previously published articles are sometimes difficult to locate and this book acts as a single source for the works. The articles are arranged in four parts: (1) "Definition and Conceptual Background," (2) "Design and Development Functions," (3) "Delivery Options," and (4) "The Profession." Articles in the first section describe the field of educational technology and provide a spectrum of theories and rationales of the field and its practitioners. The second section focuses on learning hierarchies, needs assessments, educational evaluation, and curriculum development. In the third section, methods and techniques that have influenced the improvement of learning are emphasized. The last section presents a view that is constructively critical of the ethics, values, and direction of the field of educational technology. Tracing the emergence of the field, these classic articles originated in the decades following World War II. A bibliography of additional resources concludes the collection. (AEF)