Methods and systems of validating the application of geometric dimensioning and tolerancing (“GD&T”) in a drawing. In one embodiment, a method of validating the application of GD&T in a drawing includes creating a drawing having at least one drawing element. Next, a geometric dimensioning and tolerancing rule is applied to the at least one drawing element of the drawing. The legality of the applied geometric dimensioning and tolerancing rule is then verified with a software validation tool. Each illegal application of the geometric dimensioning and tolerancing rule is indicated with the software validation tool. Finally, a report is generated with the software validation tool, which contains each illegal application of the geometric dimensioning and tolerancing rule.