The 79 classroom observation systems covered in this 12-volume anthology (over 3300 pages) were designed to collect data about human interaction. Most of them were designed to focus on behaviors of pupils and teachers in the interaction processes of teaching-learning. Some were specifically designed to collect information in particular kinds of learning settings: mathematics, foreign language, and art classrooms; biology and physics laboratory settings; and medical school lecture halls, clinics, and wards. Others were developed to study other types of human communication: nonverbal; in small groups; interaction in industrial settings; and classroom interaction in countries other than the United States. The specific foci of the dimensions of the process of communication vary from system to system and include such things as: questioning, factors of self-directed learning, dimensions of classroom structure (who talks to whom, when and how), levels of cognition, dimensions of affective (emotional) experience, and factors of physical environment. The anthology consists of the original published and unpublished materials (over 125 documents) written by the authors of the systems. These materials give the theoretical rationales and descriptions of the instruments. When available, research study findings, user's manuals, and other supplementary materials are included. A previously announced report (ED 029 833), published in 1967 and bearing the same title as this document, consists of an overview of 26 of the observation systems. (Author/JH)