Arquivo Público do Estado de São Paulo (APESP)

The Public Archive of the State of São Paulo operates an ICA-AtoM Guide to the Collection for public discovery of its archival holdings. The archive describes the service as a way for researchers to understand fonds, their contents, arrangement and the contexts in which records were created, with descriptions organised according to ISAD(G), ISAAR(CPF) and ISDF. Users can search and cross-reference descriptions and generate reports through the web interface, while APESP's main website continues to direct researchers to the guide. The live catalogue and institutional pages establish substantial use of ICA-AtoM, but they do not provide a predecessor system, implementation date or migration method. It is therefore included strictly as an adoption case.