Günther Gravel is professor for production engineering at the Hamburg University of Applied Sciences. He is the head of the Institute for Production Engineering. For more than 20 years, Dr. Gravel has studied the measurement of gears. He is now developing software for the analysis of gear measurement and for the simulation of errors in gear manufacturing processes; in fact the software mentioned in this article is part of a software deviation analysis suite. This software can be used to visualize deviations, simulate errors, calculate corrections for the manufacturing process, and evaluate ripples on a gear surface. It has been developed in cooperation with Liebherr and Klingelnberg and is available with all Klingelnberg measuring machines. For questions and practical applications contact ‘www.klingelnberg.com’ .