'Sectarianism in Early Judaism' applies recent developments in sociological analysis to sect formation and development in early Judaism. The essays examine sectarianism in a wide range of different forms: the many layers of redaction in religious texts; the development arcs of sectarian groups; the role of sectarianism across Jewish history as well as in the time of the Second Temple; and the relations within and between sects and between sects and wider society. The book aims to establish a conceptual framework for the analysis of sects and, in doing so, makes particular use of the work of Max Weber and Bryan Wilson, exploring the limits of their typologies and sociological theories.