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GDTP stands for Geometric Dimensioning and Tolerancing Professional. It is a certification program offered by the American Society of Mechanical Engineers (ASME) that verifies an individual's competence in understanding and applying the principles of Geometric Dimensioning and Tolerancing (GD & T). GD & T is an essential language used for clear communication in manufacturing, ensuring that designs are manufactured as intended.ASME's Y14.5 Standard serves as the authoritative guideline for GD & T, and GDTP certification is based on either the 1994 or 2009 revisions of this standard, including its appendices and the application of its principles and practices. The certification program offers two levels of certification: Technologist and Senior.Technologist Level Certification indicates proficiency in understanding the rules, definitions, principles, and meanings of GD & T symbols and modifiers, as well as performing calculations associated with GD & T. Technologists also apply GD & T principles to functional gaging activities.Senior Level Certification encompasses a deeper understanding of GD & T symbols, modifiers, and relationships, and the ability to make proper selections to document the product design intent. Senior-level professionals also perform calculations for geometric requirements and apply appropriate geometric control symbols, modifiers, and datum references. They further apply GD & T principles to manufacturing, quality control, verification processes, and functional gaging activities.

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