Book excerpt: The revised Fourth Edition of The SAGE Handbook of Interpersonal Communication delivers a clear, comprehensive, and exciting overview of the field of interpersonal communication. It offers graduate students and faculty an important, state-of-the-art reference work in which well-known experts summarize theory and current research. The editors also explore key issues in the field, including personal relationships, computer-mediated communication, language, personality, skills, nonverbal communication, and communication across a person's life span. This updated handbook covers a wide range of established and emerging topics, including: Biological and Physiological Processes Qualitative and Quantitative Methods for Studying Interpersonal Communication Interpersonal Communication in Work, Family, Intercultural, and Health Contexts Supportive and Divisive Transactions Social Networks Editors Mark L. Knapp and John A. Daly have significantly contributed to the field of interpersonal communication with this important reference work—a must-have for students and scholars.