Define: A Six Sigma project team identifies a project suitable for Six Sigma efforts based on business objectives as well as customer needs and feedback. As part of the definition phase, the team identifies those attributes, called CTQs (critical to quality characteristics), that the customer considers to have the most impact on quality.
Measure: The team identifies the key internal processes that influence CTQs and measures the defects currently generated relative to those processes.
Analyse: The team discovers why defects are generated by identifying the key variables that are most likely to create process variation.
Improve: The team confirms the key variables and quantifies their effects on the CTQs. It also identifies the maximum acceptable ranges of the key variables and validates a system for measuring deviations of the variables. The team modifies the process to stay within the acceptable range.
Control: Tools are put in place to ensure that under the modified process the key variables remain within the maximum acceptable ranges over time.
Source: General Elextric Compan
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