The Irish Social Science Data Archive (ISSDA) is Ireland’s leading centre for quantitative data acquisition, preservation, and dissemination. Established in 2000, ISSDA’s mission is to ensure wide access to quantitative datasets in the social sciences, and to advance the promotion of international comparative studies of the Irish economy and Irish society. To this end it acquires data from academic, research bodies and public sector sources, supporting:- Secondary use and analysis for research- Teaching and learning use- Replication and validation of research- Archival preservationAt the broadest level, ISSDA collects anonymised microdata, i.e. data that arises from surveys or administrative records relating to individuals or groups of individuals that have been cleansed of personal identifiers or other information that may enable identification of individuals represented in a dataset. Datasets collected by ISSDA generally have an Irish geographic coverage. ISSDA is based in the Library of University College Dublin, Ireland.