GD & T (Geometric Dimensioning & Tolerancing)-

GD&T is a symbolic language for researching , refining & encoding the function of each feature of a part. In addition to enabling unambiguous decoding to communicate design intent to manufacturing & quality assurance , GD&T enables scientific tolerance stack-up analysis, and is therefore in a position to absolutely guarantee the assemble ability of in-tolerance mating parts. It consists of concepts, tools, rules & processes, which are described in various military, national & ISO Standards.