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The integrated GPS system for workpiece geometry specification and verification is an improved engineering tool for product development and production. The goal of the GPS system is to provide tools for cost-effective management of variability in products and processes. This can be achieved by using a more precise way of expressing the functional requirements of the workpiece, complete and well-defined specifications and integrated verification approaches. The intended function of the product is ensured by controlling the geometry and material properties of the workpiece part (s) that make up the product. GPS is a language just for checking geometry and further development is based on computational mathematics and correct, consistent logic using general sets of rules that can be applied to all types of specifications. The paper deals with the application of GPS rules in the design of gearboxes.