The fifth in a series of annual volumes published by the International Communication Association, this yearbook provides reviews, overviews, and syntheses of developments in the evolution of the science of communication. The 40 articles in the volume are categorized as follows: (1) communication reviews and commentaries, including issues in communication theory and mass communication research in Europe; (2) information systems, including mathematical modeling in communication research; (3) interpersonal communication, including the question of validity, and six models of coorientation; (4) mass communication, including research on children and television; (5) organizational communication, including communicator competence in the workplace and the effects of job-related stress; (6) intercultural communication, including human rights as intercultural communication; (7) political communication, including communication of political information during early presidential primaries; (8) instructional communication, including a study of prosocial behavior and social reinforcement in preschool; and (9) health communication, including a study of attitudes toward mental illness. The volume concludes with a paper on theoretical interactions of receivers, sources, and attitude objects. (HTH)