List of Tables and Figures -- Foreword -- Acknowledgements -- Introduction -- 1 Theory of Cohesion Proposed by Bion and Turquet, and Modified by Others -- 2 The Fear of Annihilation and Traumatic Experience -- 3 The Fourth Basic Assumption -- 4 The Personification of Incohesion -- 5 The Treatment of Difficult Patients in Clinical Group Analysis -- 6 The Personification of Massification by Pandora -- 7 An Illustration of Incohesion -- 8 Summary, Invited Critical Commentaries, Discussion and Suggestions for Further Research and Applications -- Appendix I Some Conceptual Distinctions about Social Formations from Sociology and Social Psychology -- Appendix II Encapsulation as a Defence against the Fear of Annihilation -- References -- Subject Index -- Author Index.