Design and production of micro-mechanical assemblies is characterized by complex challenges. The small dimensions of the components are close to physical limits of micro manufacturing processes. Shape deviations cannot be avoided. They affect the interaction of single components and may even cause malfunction. At IPEK - Institute of Product Engineering Karlsruhe, a quality management strategy is developed that allows identifying the impact of shape deviations on the functional interaction of micro gears. Shape deviations can be detected and analyzed in order to find matching gears without the risk of malfunction.