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"Six Sigma is a set of techniques and tools for process improvement. It was introduced by engineer Bill Smith while working at Motorola in 1986. Jack Welch made it central to his business strategy at General Electric in 1995.Today, it is used in many industrial sectors.
It seeks to improve the quality of the output of a process by identifying and removing the causes of defects and minimizing variability in manufacturing and business processes. It uses a set of quality management methods, mainly empirical, statistical methods, and creates a special infrastructure of people within the organization who are experts in these methods. Each Six Sigma project carried out within an organization follows a defined sequence of steps and has specific value targets, for example: reduce process cycle time, reduce pollution, reduce costs, increase customer satisfaction, and increase profits.


IASSC
The International Association for Six Sigma Certification (IASSC) is a Professional Association dedicated to growing and enhancing the standards within the Lean Six Sigma Community. IASSC is the only independent third-party certification body within the Lean Six Sigma Industry that does not provide training, mentoring and coaching or consulting services. IASSC exclusively facilitates and delivers centralized universal Lean Six Sigma Certification Standards testing and Lean Six Sigma training program Accreditations


Six Sigma professionals exist at every level – each with a different role to play. While implementations and roles may vary, here is a basic guide to who does what.

At the project level, there are black belts, master black belts, green belts, yellow belts and white belts. These people conduct projects and implement improvements.

Black Belt: Leads problem-solving projects. Trains and coaches project teams.
Green Belt: Assists with data collection and analysis for Black Belt projects. Leads Green Belt projects or teams.
Master Black Belt: Trains and coaches Black Belts and Green Belts. Functions more at the Six Sigma program level by developing key metrics and the strategic direction. Acts as an organization’s Six Sigma technologist and internal consultant.
Yellow Belt: Participates as a project team member. Reviews process improvements that support the project.
White Belt: Can work on local problem-solving teams that support overall projects, but may not be part of a Six Sigma project team. Understands basic Six Sigma concepts from an awareness perspective.

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This application is just an excellent tool for self-study and exam preparation. It's not affiliated with or endorsed by any testing organization, certificate, test name or trademark.