Abstract: The article first provides an overview of the theoreticalprinciples essential to the development of the methodology anddocumentation of archaeological excavations. The same principleshave underpinned the digital documentation system designed andused by the company PJP d.o.o. and the Celje Regional Museum.In particular, the article focuses on the custom-made digitaldocumentation software solution, its continued development, theassociated database, and the introduction of new documentationmethods (photogrammetry, 3D models). The database and 3Ddocumentation procedures have been designed to facilitate use inGIS software, which is increasingly gaining importance beyondmere visualisation. Besides minimising the time required for postexcavationprocedures, such an approach improves the quality(accuracy, reliability) of the interpretation. Furthermore, it allowsa reconstruction of the excavation site and each individual phase.Digital documentation procedures yield large amounts of datawhich, in essence, are a transformed version of the cultural heritagethat was destroyed in the process. In this sense, the data itselfbecomes cultural heritage and as such must be handled carefullyin its own right.