Origins and evolution of Lean and Six Sigma

Learning objectives

• Describe the practical origins of Lean and Six Sigma.
• Separate durable principles from historical mythology.
• Recognize modern integrated practice.

Where the ideas came from

Lean grew from flow, pull, quality-at-source, small batches, standardized work and continuous improvement. Six Sigma combined quality engineering, statistical control, customer focus, structured projects and organizational roles. Modern practice integrates the two.

Garment-factory example

Garment factories adapt flow and pull to short style runs while using statistical methods to control measurement, shade, strength and defect variation.

Method

1. Learn the principle in its original context.
2. Translate it to the current process.
3. Test it on a small scale.
4. Retain what improves customer and workforce outcomes.

Common mistakes

• Copying automotive layouts without garment context.
• Treating history as a substitute for application.