A method to minimize production costs by showing the dimensioning and tolerancing on a drawing while considering the functions or relationships of part features.

A set of fourteen symbols used in the language of GD&T. It consists of well-defined of symbols, rules, definitions and conventions, used on engineering drawings to accurately describe a part. GD&T is a precise mathematical language that can be used to describe the size, form, orientation, and location of part features. GD&T is also a design philosophy on how to design and dimension parts.

a method for explicitly describing a geometry and the allowable variation in the size and position of its features. It is often referred to by the abbreviation, GD&T. There are many standards available world-wide that describe the symbols and define the rules used in GD&T, including ASME Y14.5M-1994.