The use of PMI Representation (aka semantic PMI) will allow software developers to automate various design (CAD), manufacturing (CAM), and inspection (CMM) functions because the engineering application software associated with these functions can process the PMI directly. One of the objectives of PMI standards is to define the semantics of the words and symbols used to communicate manufacturing information in 3D computer models. PMI includes geometric dimensioning and tolerancing, 3D annotations, surface texture specifications, finish requirements, process notes, material specifications, welding symbols, and other information. NIST has created a Test System to measure conformance of Computer-Aided Design (CAD) software to American Society of Mechanical Engineers (ASME) standards for Product and Manufacturing Information (PMI), specifically geometric dimensioning and tolerancing (GD&T) information.
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