Six Sigma is a data-driven approach to improving business processes that’s often used by project managers. This Six Sigma guide covers its benefits, uses, methodologies, belt levels, and more.

Six Sigma was first introduced in 1986 by Bill Smith, an engineer at Motorola, and then registered as a Motorola trademark on December 28, 1993. The term Six Sigma means that 99.99966% of all output is expected to be defect free.

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