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The '''Micro DBMS''' was the first-large scale set theoretic [[database management system]] to be used in production.<ref>[httphttps://doidocs.acmgoogle.orgcom/10.1145/1095495.1095500open?id=0B4t_NX-QeWDYNmVhYjAwMWMtYzc3ZS00YjI0LWJhMjgtZTYyODZmNmFkNThh "A set theoretic data structure and retrieval language" (PDF)], William R. Hershey and Carol H. Easthope, PapersPaper 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, Special Interest Group on Information Retrieval, Association for Computing Machinery, New York, NY, USA10.1145/1095495.1095500]</ref> Its major underpinnings and algorithms were based on the set-theoretic model of 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> It provided a natural language interface which allowed non-programmers to use the system.<ref>[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>
Implementation of Micro began in 1970 at the University of Michigan's Institute of Labor and Industrial Relations (ILIR) running under the [[Michigan Terminal System]], the [[S/360]] and [[S/370]] time-sharing system developed at U-M. It was first used for the study and analysis of micro-statistics contained in the United States Census data base; hence the name of the system. 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 [[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. It continued to be used in production until 1998.
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