During development it was recognised that in order to give the tool wide applicability within a broad range of organisational infrastructures a degree of flexibility was necessary; initially an ability to specify folder and directories for comparison was an obvious development. For those following an Open Archival Information System (OAIS) reference model, the tool allows comparison of the Submission Information Package (SIP), Archival Information Package (AIP) and Dissemination Information Package (DIP) allowing a full audit of the contents of the archive [2]. Although the flexibility of the tool means there is potential to extend its use to almost any structure. The tool allows any assessments to be recursive through existing structures, meaning comparisons can also be implemented at the highest level of the file structure. The tool also addresses the difficult issue of relating files in different formats by allowing users to stipulate which file types should be matched with which other format, thereby making the resulting audit more accurate. This feature is particularly useful in an archive environment where the file type which is initially deposited is often different from the archived or disseminated format. So, for example, if an archive contains Microsoft Word documents (.doc), preservation policy dictates that they should be preserved in Microsoft Word Open XML (.docx) and disseminated as Portable Document Format (.pdf); the tool allows users to set this relationship at the outset. Once an audit has been completed the results are viewed in discrete datasheets which allow for a straightforward comparison of files that have been ‘Matched’ or those where files may be missing or mismatched. Each of the items in the audit results is also hyperlinked, so that users can move directly to the specific file location; this appears in a pop-up window. Throughout development an awareness of the broad technical ability of potential users made the development of a simple Graphical User Interface (GUI) a necessity.