Definition of Lean Six Sigma

Lean Six Sigma is a relatively new quality improvement methodology resulting from the combination of the individual Lean and Six Sigma methodologies. It started in the late 1990s when both AlliedSignal and Maytag began cross-training employees in the two frameworks and combined aspects of each.

Lean Goals

Lean focuses on eliminating waste from processes and increasing process speed by focusing on what customers actually consider quality, and working back from that.

Six Sigma Goals

Six Sigma aims to eliminate process variation and make process improvements based on the customer definition of quality, and by measuring process performance and process change effects.

Lean Methods

Value Stream Mapping involves clarifying the customer base, listing the process steps, establishing which steps are value-add, and reworking the process so the value-add steps flow without interruption.

Six Sigma Methods

The main Six Sigma technique is the 5-step DMAIC process: Define the problem, Measure the current situation, Analyze for root cause, Improve the process effectively, and Control the process to maintain the gain.

Implementations

In some companies, different groups of employees receive training in Lean and Six Sigma methods, and are called upon to conduct separate projects based on business need.

Considerations

A focus on Lean occurs when short-term gains are desired and business leaders believe that a value stream map will reveal appropriate solutions; Six Sigma is preferred when the problem is not obvious, and/or when a longer time frame is required.

Resources

• Lean Six Sigma Case Studies