In the context of Six Sigma, Parts Per Million or Part Per Million (PPM) measurement is a metric used to quantify the defect rate or the number of defective units in a manufacturing process.

Parts per million (PPM) in Lean Six Sigma is a measure of how many defects exist in a process or product. It is typically used to measure the defect rate of products or services during a particular period of time and can be calculated by dividing the number of defective items by the total number of units produced, multiplied by one million.

One of the core metrics in Six Sigma is Parts Per Million (PPM), which quantifies the defect rate or number of flawed units in a manufacturing or service process. In its relentless pursuit of perfection, Six Sigma aims for a quality level where defects barely happen—no more than 3.4 defects per million chances (DPMO).