A method and apparatus for optimizing the yield of tested electronics devices is provided. A sample device is characterized to derive a specification for each device in the group. The sample size is chosen to provide reliable data and to minimize the effect of outlier devices on the characterization. After characterization, boundaries are set for the group of tested devices. Boundaries may be set based on voltages optimized for power consumption. The group of devices may be further subdivided into sub-groups based on the results of testing. The sub-groups are each assigned a unique code that reflects the results of the testing. This code is programmed into automated test equipment and is also stored in system software in order to ensure consistent values across the group of tested devices. The automated test equipment and system software are correlated using the same code to ensure higher test yield.