According to Wikipedia, Six Sigma “seeks to improve the quality of process outputs by identifying and removing the causes of defects (errors) and variability in manufacturing and business processes. It uses a set of quality management methods, including statistical methods, and creates a special infrastructure of people within the organization who are experts in these methods.”
Six Sigma contains two project methodologies:
DMAIC: Improving existing business process
DMADV: Creating new product or process designs
DMAIC has five phases:
- Define high-level project goals and the current process
- Measure key aspects of the current process and collect relevant data
- Analyze the data to verify cause-and-effect relationships
- Improve or optimize the process based upon data analysis
- Control to ensure that any deviations from target are corrected before they result in defects
DMADV also has five phases:
- Define design goals that are consistent with customer demands and the enterprise strategy
- Measure and identify characteristics that are critical to quality, product capabilities, production process capability, and risks
- Analyze to develop and design alternatives, create a high-level design and evaluate design capability to select the best design
- Design details, optimize the design, and plan for design verification
- Verify the design, set up pilot runs, implement the production process and hand it over to the process owners
To aid in implementing the Six Sigma process, many different tools can be used. Quality measurement tools such as portable CMMs have proven to be a great addition to companies looking to improve their products and processes. They continue to help quality professionals determine product defects earlier in the manufacturing process, ensuring parts meet customer standards.
Referenced from: http://en.wikipedia.org/wiki/Six_Sigma
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