The project is based on three principles:
1) Archaeological institutions have an interest in finding non-professional photographs of their excavations. By finding ‘new’ photographic material, the existing documentation of the excavation will be extended and enhanced and can provide an image of aspects of an excavation which are not included in the published documentation. In addition, as has been demonstrated above, this genre of photographs may provide the institutions with additional scientific data which may be useful for the archaeological research relating to the specific site(s). Furthermore, by comparing the non-professional photographs with the official documentation made by the former staff, it is also possible to get a notion of the practised documentation policy at that site. Pictures of particular features or phases of the excavation taken by non-professionals and which are not present in the official documentation, reveal the decisions taken by the staff at the time of what to record and what to leave out. In this way, comparing the two categories of recording offers institutions insight into the development of this area of the archaeological discipline.
2) Archaeological institutions have an interest in digitising newly-discovered non-professional photographs and in making them accessible to both scholars and the general public. Frequently, over the years, it has become practice for institutions to join forces and work in co-operation on a specific archaeological campaign. By sharing the newly-discovered photographic material via digital databases, they will be within easy reach of all parties concerned.