The Group Development Process Analysis Measures were designed to facilitate the study of development in small groups. The measures include three scales for the process analysis of verbal content and style dimensions, a set of speech behavior codes, and a sociometric test for the identification of emergent leaders. The primary focus of this chapter is on the process analysis scales and the speech behavior measures. The process analysis scales are (a) the Hostility/Support Scale; (b) the Experiencing Scales (Klein, Mathieu-Coughlan, & Kiesler, 1986) adapted for use in the study of group psychotherapy; and (c) the Normative Organizational/Personal Exploration (NO/PE) Scale, which is used to rate units created by the Topic-Oriented Group Focus Unitizing Procedure. The Speech Behavior Coding System includes measures for length of statement, who is speaking, who is spoken to, and how frequently the group members refer to themselves as "we."The process of development in small groups has been studied conceptually for about 50 years. The foundations of the theory of phases in 22 1