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In the 1970s [[G.M. Nijssen]] developed "Natural Language Information Analysis Method" (NIAM) method, and developed this in the 1980s in cooperation with [[Terry Halpin]] into [[Object-Role Modeling]] (ORM). However, it was Terry Halpin's 1989 PhD thesis that created the formal foundation on which Object-Role Modeling is based.
Bill Kent, in his 1978 book ''Data and Reality,''<ref>{{citation|title=Data and Reality |url=http://www.bkent.net/Doc/darxrp.htm}}</ref> compared a data model to a map of a territory, emphasizing that in the real world, "highways are not painted red, rivers don't have county lines running down the middle, and you can't see contour lines on a mountain". In contrast to other researchers who tried to create models that were mathematically clean and elegant, Kent emphasized the essential messiness of the real world, and the task of the data modeler to create order out of chaos
In the 1980s, according to Jan L. Harrington (2000), "the development of the [[object-oriented]] paradigm brought about a fundamental change in the way we look at data and the procedures that operate on data. Traditionally, data and procedures have been stored separately: the data and their relationship in a database, the procedures in an application program. Object orientation, however, combined an entity's procedure with its data."<ref name="JLH00">Jan L. Harrington (2000). ''Object-oriented Database Design Clearly Explained''. p.4</ref>
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