Six sigma is a quality system based on measurements of how well an organisation meets customer requirements. It is a widely practiced leadership framework and management methodology that drives business improvement. It can be defined as ” a business process that allows organisations to drastically improve their bottom line by designing and monitoring every day business activities in ways that minimize waste and resources while increasing customer satisfactions”.
Six sigma is a process capability technique. The technical elaboration of Six Sigma can be achieved through the use of normal distribution and process capability indexes. Six Sigma was developed for solving the complexity of products and observing the failure of the products in order to achieve the predictive performances. Similar to six sigma methodology, in a process capability study, the number of standard deviations between the process mean and the nearest specification limits is given in six sigma units. The sigma quality level of a process can be used to express its capability that means represents the variation about the process mean.
The application of six sigma methodology provides reduction in variance and augmentation in the process capability. A six sigma process can be interpreted in terms of process capability,which is associated with process variation. Process capability measures have been used to provide number of nonconforming product. At a six sigma capability level, a process will produce vary few defects. This level is more commonly referred to as six sigma capability.
According to Mr. Jack Welch___” Six sigma is a disciplined quality improvement methodology that focuses on moving every process that touches the customers-every product and service-towards near perfect quality”. It is a measure of the company’s quality”
Thus, is one sense, six sigma refers to a measure of process consistency and aims at achieving the same. The other meaning of six sigma is a methodology for improving processes. It is a also a movement that has established process improvement at many leading organization and trained thousands of employees for improvement of process in their organizations. Six sigma is probably the most widely used methodology for improving process performance and is increasingly popular as a way of organising an entire organization to become more customer-focused and more quality-oriented.
Goals of Six Sigma
- To improve customer satisfaction
- To standardize business development
- To coordinate metrics with suppliers and customers
- To ensure industry and government compliance
- To develop career growth opportunities
- To reduce variations
- To reduce defects/rework
- To improve yield/productivity
- To improve the bottom line.
- To Improve the top line
Benefits of Six sigma
- Design better products
- Improve quality
- Top down approach
- Rapid and almost radical improvements
- Transforms the entire organization
- Provides a consists metric
- Customer is always in focus
- Continuous improvement process
Benefits of Six sigma
- Process mapping
- XY matrix
- Measurement system analysis
- Process capability tool
- Multivariate study
- Hypothesis testing
- Failure mode effect analysis
- Design of experiments
- Control plan