ABSTRACT Patterns, characteristics and styles of interpersonal communication in 316 adult men and women were investigated by use of an Interpersonal Communication Inventoy. Development of the Inventory was based upon previous research in related areas of marital communication, parent-child communication, group therapy and intragroup communication. Item analysis yielded 50 items which discriminated between good and poor communicators. Factors of good and poor communication are identified and discussed. Uses of the Inteversonul Communication Inventory in counseling, teaching and research are proposed.