This study provides a taxonomic structure for the discourses which constitute institutional memory and the ways in which such memory structures identity of an institution and of people within an institution. It proposes the dimensions of written - oral, official - unofficial, and intentional - secondary, and discusses how these categories shape the landscape of memory, with particular attention to informal and formal oral narratives told over a long period of time, and their relation to materially preserved forms of memory. The social aspect of memory is remembering: for example, a file cabinet preserves some of a corporations' written memories, but it does so only if people use it as a resource for remembering. Similarly a narrative functions in an insitution only if it is regularly told, and has the potential to be transmitted to new tellers. Therefore, a taxonomy of occasions for narrative remembering is also presented. Finally, this study examines who in institutions have or do not have the right to represent the institution's memory, and the ways in which silences and erasures can be recognized and studied.