Six Sigma is broken down into two different processes:
- Six Sigma DMADV — a process that defines, measures, analyzes, designs and verifies new processes or products that are trying to achieve Six Sigma quality.
- Six Sigma DMAIC — a process that defines, measures, analyzes, improves and controls existing processes that fall below the Six Sigma specification.
Six Sigma processes are carried out by professionals deemed by Motorola as either Six Sigma Green Belts or Six Sigma Black Belts, the Black Belts having more expertise in the Six Sigma process.
The term is derived from the Greek letter sigma, a mathematical term that represents a measure of variation.
According to Motorola, Six Sigma has had non-manufacturing applications in transactional processes, such as billing and customer support.