This book examines the major business communication theories, delving into their relationships and practical applications. Many business communication studies lack a strong theoretical grounding—a deficit that creates difficulties for researching business communication phenomena and building upon previous studies. The book addresses this issue by cataloging and briefly describing the major business communication theories, as well as giving a typology of these theories to better integrate them. This book provides value to business communication researchers (who can use it to build upon and develop their work), experts in practice (who can apply it to improve business communications), and academics (who can use it to enhance their instructional designs). It also offers insights into new developments on the business communication theory horizon.