There is a general lack of in-depth research into what it means (and takes) to be a member of a small group. Firstly, research is often focused on leadership rather than on membership and, secondly, empirical research tends to focus on studying group outcomes rather than group process. The purpose of this research was to explore the forces involved in being a member of a small group and to develop a research method for doing so. A post foundational philosophical stance was adopted in terms of which the need both for discovering universal truths as well as gaining in-depth understanding within context, was pursued. A constructivist grounded theory design was adapted by developing a theoretical lens with which to facilitate the coding and analysis of the data. This theoretical lens was based on an integration of Kurt Lewin’s field theory; Wilfred Bion’s psychoanalytic group-as-a-whole approach; S.H. Foulkes’s group analytic approach and Yvonne Agazarian’s theory of living human systems. The data consisted of transcribed video material of ten 90-minute sessions conducted with a training group of 9 members; written reflections by the group members on their group experience as well as field notes taken by the researcher during the training group sessions. Through the application of the theoretical lens to the data, member behaviour was coded both deductively and inductively, thus allowing the data to speak for itself whilst maintaining a rigorous analytical structure. The result of this exploration was an emerging field theory of group membership which postulates the group member as existing within a field of forces (both pro- and anti-group) operating between the triangular ‘polarities’ of belonging, individuality and task. The theoretical and practical implications of this field theory are discussed in terms of their relevance to both grounded theory research methodology and group psychology. Finally, it is shown how this research can be used as a foundation from which to conduct a multitude of future studies into group processes from the perspective of the group member.