The total number of defects counted on the population in question divided by the total population count. Defects are parts that do not conform to specifications as discovered by the end user. The objective is to first minimize post-delivery and in-plant defects. This ratio is a measure of defects produced. This measurement considers the various components manufactured by the facility. The ratio can easily relate to 3 sigma and 6 sigma quality. 3 sigma quality indicates a defect rate of 2700 PPM and 6 sigma quality indicates a defect rate of approximately quality indicates a defect rate of approximately 4PPM. Defects are an indication of product engineering quality or manufacturing quality based on the level defects recorded. The objective is to minimize all defects.