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The simple answer is that six sigma is a very formal, systematic approach to solving problems. It follows a somewhat generic pattern. However, it takes a more holistic approach for the entire organization. Rather than sub-optimizing the solution to a specific problem or concern, it forces the experimenter to see the whole solution and its effects. The problem-solving approach that six sigma takes is basically:
Defining the problem. Listing and prioritizing problems, defining the project and the team.
Diagnosing the problem. Analyzing the symptoms, formulating theories of causes, testing these theories, and identifying root causes.
Remedying the problem. Considering alternative solutions, designing solutions and controls, addressing resistance to implementation, implementing solutions and controls.
Holding the gains. Checking performance and monitoring the control system.
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