American Society of Mechanical Engineers

Geometric Dimensioning and Tolerancing Professional (GDTP) - Senior Level

The Technologist level examination emphasizes the applicant’s knowledge of GD&T principles, concepts, and practices in accordance with. ASME Y14.5-1994 or ASME Y14.5-2009. Certification indicates that the individual has demonstrated competencies in the understanding of the symbols, modifiers, and relationships of Geometric Dimensioning and Tolerancing (GD&T) as applied to engineering drawings and related documentation.

Geometric Dimensioning and Tolerancing Professional (GDTP) - Technician Level

The Senior level examination emphasizes knowledge, selection, and application of the dimensioning and tolerancing principles, concepts, and practices contained in ASME Y14.5-1994 or ASME Y14.5-2009, including appendices. Certification indicates that the individual has demonstrated competencies in the understanding of geometric tolerancing and related principles, tolerance calculation, datum feature selection, application of modifiers in feature controls and composite tolerances.