This article discusses the post-excavation analysis and archiving of data generated by fieldwork undertaken at Heslington East near York in the UK. This project, stretching over two decades, involved two commercial companies and a student training and local community element, and recently concluded with a thematic publication (Roskams and Neal 2020). The article has twin objectives. First, on a theoretical level, it reflects on the complex challenges that arise when attempting to combine diverse stratigraphic, spatial and assemblage data from different sources to reach meaningful interpretations of an extensive, multi-period landscape. Second, on a practical level, it aims to act as an introduction to the project's archives to make them accessible to future audiences, something that is essential if we are to enable any re-interpretation of the site. I suggest that such archives embody a series of transformations. These comprise first the interpretation of reconnaissance and evaluation procedures, converted to generate an excavation strategy, something briefly summarised here. I then discuss at greater length: the processes of post-excavation analysis of stratigraphic and spatial data, and their relationship with the MoRPHE requirement (Historic England 2006) to select particular assemblages for detailed analysis; linking the latter, specialist reports on selected assemblages to preliminary interpretations of site evidence, an iterative process that creates more soundly based understanding; and the recasting of summaries of the most significant evidence in these secondary interpretations to fit the thematic organisation of the published report. I argue that each of these hierarchically ordered transformations needs to be understood if we are to facilitate effective re-use of site archives.