Beginning in July 1, 2006, the Manuscript Section has made accession records in MARC format for all curatorial departments. The previous database, HMA (Houghton Manuscript Accessions, an Access database created for the Manuscript Department circa 1999 from the original MARC-based BibBase), was frozen at that time. (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.
In recent years accessioning became a backlog-preventive measure. Since 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 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 may have 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 is tracked in ArchivesSpace by creating an accession record for all incoming material, single items, aggregates, accruals, and so on.