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'''Model-based definition''' ('''MBD'''), sometimes called '''digital product definition''' ('''DPD'''), is the practice of using [[3D modeling|3D models]] (such as [[solid model]]s, 3D [[Product and manufacturing information|PMI]] and associated metadata) within 3D [[computer-aided drafting|CAD]] software to define (provide specifications for) individual components and product assemblies. The types of information included are [[geometric dimensioning and tolerancing]] (GD&T), component level materials, assembly level [[bill of materials|bills of materials]], engineering configurations, design intent, etc. By contrast, other methodologies have historically required accompanying use of 2D [[engineering drawing]]s to provide such details.<ref>[http://model-based-enterprise.org/Docs/MIL-STD-31000A%20released%20on%20ASSIST%203%2013%202013.pdf "MIL-STD-31000 Rev A"], p36, 26 February 2013. Retrieved on 23 April 2015.</ref>
==Use of the 3D digital data set==
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