Beginning in July 1, 2006, the Manuscript Section made accession records in MARC format for all curatorial departments. The previous accessions database, HMA (Houghton Manuscript Accessions, an Access database created for the Manuscript Department circa 1999 from the original MARC-based product, BibBase), was frozen at that time. (Cataloger Bonnie Salt completed a project to create MARC records for all earlier materials appearing only in HMA.) Until approximately 2006, the Harvard Theatre Collection maintained separate accessioning practices and files.
Accessioning then became a backlog-preventive measure. Beginning April 1, 2011, "preliminary box lists" for accessioned collections were posted to OASIS (pending curatorial review). Legacy box lists in Word and other formats were occasionally converted to EAD and uploaded into OASIS or, later, ingested into ArchivesSpace.
Until June 30, 2017 every item, collection, or collection accrual entering Houghton received a MARC accession record; collections of approximately two or more boxes usually received a box list in EAD. Both of these records were derivative of the rules for full, standards-compliant Houghton cataloging of single items and collections.
As of July 1, 2017, accessioning was tracked in ArchivesSpace by creating an accession record for all incoming material, whether a single item, collection, or accrual to a collection. All collections then received collection-level finding aids, MARC records, and, if larger than 2 linear feet, series- or file-level finding aids. Collections were described as minimally processed and were generally open to research.