The American Society of Mechanical Engineers offers certification programs for geometric dimensioning and tolerancing.

There are two levels of certification available at ASME - technologist and senior.

Technologist Level Certification

The technologist level certification provides an objective measure of an individual's ability to understand drawings which have been prepared using the language of Geometric Dimensioning and Tolerancing (GD&T), as defined in the ASME Y14.5 Standard.

The Technologist Level examination is a maximum of 4 hours in duration consisting of 100 to 150 questions. The examination is structured as a closed book, multiple choice, written examination, evaluating the applicant's knowledge of GD&T principles, concepts, and practices in accordance with the current ASME Y14.5 Standard. The approximate distribution of questions will be as follows:

(a) 10% of the questions on scope, definitions, and general dimensioning.

(b) 10% of the questions on general tolerancing and related practices; and former practices included in Appendix D of ASME Y14.5.

(c) 5% of the questions on symbology

(d) 15% of the questions on datum referencing

(e) 30% of the questions on tolerances of location

(f) 30% of the questions on tolerances of form, profile, orientation, and runout.

A candidate must achieve at least a 75% grade overall, and at least 50% in each of the above categories.

Senior Level Certification

The senior level certification, provides the additional objective measure of an individual's ability to select proper geometric controls as well as to properly apply Geometric Dimensioning and Tolerancing to drawings.

The Senior Level examination is a maximum of 6 hours in duration consisting of 100 to 150 questions. The examination is structured as a closed book, multiple choice, written examination. The Senior Level examination will emphasize knowledge, selection, and application of the geometric dimensioning and tolerancing (GD&T) principles, concepts, and practices contained in the current ASME Y14.5 Standard and Appendices. The approximate distribution of questions will be as follows:

(a) 10% of the questions will cover topics from the Technologist's Level Body of Knowledge (see above)

(b) 20% of the questions on datum selection

(c) 40% of the questions on geometric tolerancing & related principles, tolerance calculation, and appendices

(d) 15% application of modifiers in feature control frames

(e) 15% composite tolerancing.

A candidate must achieve at least an 80% grade overall, and at least 50% in each of the above categories.