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The '''MICRO Relational Database Management System''' was the first large-scale [[set-theoretic]] [[database management system]] to be used in production.<ref name=Hershey1972>[https://docs.google.com/open?id=0B4t_NX-QeWDYNmVhYjAwMWMtYzc3ZS00YjI0LWJhMjgtZTYyODZmNmFkNThh "A set theoretic data structure and retrieval language" (PDF)], William R. Hershey and Carol H. Easthope, Paper from the Session on Data Structures, Spring Joint Computer Conference, May 1972 in ''ACM SIGIR Forum'', Volume 7, Issue 4 (December 1972), pp. 45-55, DOI=[http://doi.acm.org/10.1145/1095495.1095500 10.1145/1095495.1095500]</ref>. Though the heading of Information Management System may seem to imply a CODASYL based architecture, the heading was established before it was recognized that MICRO's architecture was actually that of an RDBMS.[6]) Its major underpinnings and algorithms were based on the Set-Theoretic Data Structure (STDS) model developed by D. L. Childs of the University of Michigan's CONCOMP (Conversational Use of Computers) Project.<ref name=North2010>[http://drdobbs.com/blogs/database/228700616 "Sets, Data Models and Data Independence"], by Ken North a Dr. Dobb's Blogger, March 10, 2010</ref><ref>[http://hdl.handle.net/2027.42/4163 ''Description of a set-theoretic data structure''], D. L. Childs, 1968, Technical Report 3 of the CONCOMP (Research in Conversational Use of Computers) Project, University of Michigan, Ann Arbor, Michigan, USA</ref><ref>[http://hdl.handle.net/2027.42/4164 ''Feasibility of a Set-Theoretic Data Structure : A General Structure Based on a Reconstituted Definition of Relation''], D. L. Childs, 1968, Technical Report 6 of the CONCOMP (Research in Conversational Use of Computers) Project, University of Michigan, Ann Arbor, Michigan, USA</ref> MICRO featured a natural language interface which allowed non-programmers to use the system.<ref name=MICROManual1977>[http://docs.google.com/viewer?a=v&pid=explorer&chrome=true&srcid=0B4t_NX-QeWDYZGMwOTRmOTItZTg2Zi00YmJkLTg4MTktN2E4MWU0YmZlMjE3 ''MICRO Information Management System (Version 5.0) Reference Manual''], M.A. Kahn, D.L. Rumelhart, and B.L. Bronson, October 1977, Institute of Labor and Industrial Relations (ILIR), University of Michigan and Wayne State University</ref><ref>[https://docs.google.com/open?id=0B4t_NX-QeWDYZGJqRVBaSEdMVnc ''MICRO: A Relational Database Management System''], Harry F. Clark, David E. Hetrick, Robert C. Bressan, July 1992, Institute of Labor and Industrial Relations (ILIR), University of Michigan, 451 pages, ISBN 9780877363507</ref>
Implementation of MICRO began in 1970 as part of the Labor Market Information System (LMIS) project at the University of Michigan's Institute of Labor and Industrial Relations (ILIR). Dr. Malcolm S. Cohen was Director of the LMIS Project and was the principal innovator and designer of the original MICRO Retrieval System.<ref>[http://www.eric.ed.gov/ERICWebPortal/search/detailmini.jsp?_nfpb=true&_&ERICExtSearch_SearchValue_0=ED094719&ERICExtSearch_SearchType_0=no&accno=ED094719 ''Feasibility of a Labor Market Information System, Volume 3, Final Report for Period July 1, 1970-June 30, 1974''], Malcolm S. Cohen, Labor Market Information System (LMIS) Project, Institute of Labor and Industrial Relations, University of Michigan, June 1974, 76 pages, PDF</ref> Carol Easthope and Jack Guskin were the principal programmers. D.L. Childs, Vice President of Set Theoretic Information Systems (STIS) Corporation, provided continuing guidance in the use of Set-Theoretic Data Structure (STDS) data access software for MICRO. Funding came from the Office of Manpower Administration within the U.S. Department of Labor.<ref name=MICROManual1977/> MICRO was first used for the study of large social science data bases referred to as micro data; hence the name. Organizations such as the [[United States Department of Labor|US Department of Labor]], the [[United States Environmental Protection Agency|US Environmental Protection Agency]], and researchers from the [[University of Alberta]], the [[University of Michigan]], [[Wayne State University]], the [[University of Newcastle upon Tyne]], and [[Durham University]] used MICRO to manage very large scale databases until 1998.
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