This thesis consists of an investigation of a prophetic work and its place in the greater concepts of prophecy and apocalyptic. The different dimensions of the term 'apocalyptic' are explored: literature, world-view and theological movement. These aspects are utilized to frame a definition. There is demonstration of different theories of prophecy's transition to apocalyptic, how these theories each partially illuminate the processes at work within post-exilic Judaism, and how they contribute to an understanding of the origin, sociological setting and essential characteristics of apocalyptic. The divergence within the apocalytic movement is documented, necessitating the rejection of the notion of direct development from any one post-exilic theological tradition.