Six Sigma

Six Sigma’s methodology was developed in the 1980s by a scientist at Motorola. It involves using statistical data as a type of quality control to eliminate defects, reduce the number of variations in an end product, and improve processes in a business.

The Six Sigma concept says that all processes in an organisation can be measured and optimised for improvement using a statistical benchmark.

Six Sigma helps manufacturing businesses improve the overall consistency of products, ultimately resulting in more satisfied customers and a better brand reputation.

There are five stages of Six Sigma for existing processes:

1. Defining
2. Measuring
3. Analysing
4. Improving
5. Controlling

These can be remembered by the mnemonic: DMAIC.

There are also five stages of Six Sigma for new processes:

1. Defining
2. Measuring
3. Analysing
4. Designing
5. Verifying

These can be remembered by the mnemonic: DMADV.

In addition to the Six Sigma concept is Lean Six Sigma.

Lean Six Sigma is a slightly different process improvement technique that aims to minimise the waste of physical resources, time, effort, and talent while supporting the standardisation of work. It uses a combination of Six Sigma and Lean Manufacturing tactics and is more of a team-focused, managerial approach.

In Lean Six Sigma methodology, any resource that doesn’t provide value for the end user/customer is seen as waste and should be removed from the process.