System documenting excavations that developed in the mid 1970s. It focuses on the definition of irreducible stratigraphic units, or contexts, and their removal in reverse stratigraphic order to their deposition. Each context is numbered with a unique identifier, planned as a separate entity, described on a pro‐forma context record, and its relationships to all other contexts on the site established and summarized on a matrix. All finds, samples, and other records (e.g. photographs, laser scans, sections, profiles, etc.) are linked back to the unique context identifier to allow full analysis of the site during the post‐excavation assessment and reporting.