The Archaeological Survey of Ireland operates a flat or simplified hierarchical 'class’ list to support the management and curation of its records and assist in indexing and maximising the retrieval of information. The list is arranged alphabetically and is accompanied by a ‘scope note’ for each term which may also include guidance on its use. As the terms have evolved over time they cannot be considered exhaustive or comprehensive. They are indicative of its record holdings and reflect the incremental and organic manner in which material has been added to the archive over many years, especially for monuments dating from the post-1700 AD period. While every effort has been made to ensure consistency of use, the terms should be considered as a fairly authoritative guideline only. The list is subject to review and amendments and enhancements are made on an on-going basis.