Course Description This comprehensive one day program provides a solid introduction for those new to the gear industry as well as an excellent review for experienced technologists. The Basic Gear Metrology module focuses on the involute helicoid system that is widely used for cylindrical gears and splines. Composite and elemental measurement methods are described and contrasted. Categories, causes, and consequences The Calibration and Metrology module explores the subject of measurement validity beginning with discussion of important but often overlooked metrology issues. New traceability and calibration concepts are outlined. An introduction to statistical estimation of measurement uncertainty is included. The Gear Accuracy Standards module brings participants up to date with the recent changes in A Spline Measurement Module can also be included in the program. Training groups are kept small so that individual concerns may be fully addressed