This standard is intended to provide a uniform method of determining proportion nonconforming in finished components and to provide a standardized definition of the quality index referred to as PPM. The method used here is primarily directed at components whose production or procured volume is large enough, during some predefined sampling period, to give statistically meaningful information.
SAE EIA-554_2-2016 history
2016SAE EIA-554_2-2016 Assessment of Nonconforming Levels In Parts Per Million (PPM)