Module 6 · Lesson 17 of 17
Control tollgate and sustainability exercise
This lesson and the entire Lean Six Sigma Black Belt academy are free of charge — no fees, ever.
Learning objectives
- Explain the purpose of control tollgate and sustainability exercise in a garment-factory improvement project.
- Apply the described method to a representative shop-floor situation.
- Recognize the common mistakes and how to avoid them.
Concept
The Control tollgate confirms stable performance, embedded ownership, verified benefits, complete documentation, and a tested response system.
Required evidence: control plan, SOP/standard work, poka-yoke validation, chart and reaction plan, repeat MSA, sustained capability, training competency, adoption data, benefits validation, FMEA residual risk, handover, lessons learned, and audit schedule.
Gate questions cover actionability of signals, cross-shift operability, sustained benefits, owned open risks, and demonstrated abnormal-response drill.
Garment-factory example
A line implemented setup verification, needle-life control, standardized work, visual signals, and SPC after a successful seam-damage pilot; the Control tollgate reviews all evidence.
Method
- Compile the evidence pack.
- Independent review.
- Owner presents live controls.
- Sign off or return with due date.
- Publish lessons learned.
Common mistakes
- Closing on pilot data.
- Relying on the project leader for operation.
- Updating documents without observing practice.
Knowledge check
Pick one answer per question. Explanations appear after you submit.
1. A passing Control tollgate requires:
2. Lessons learned should be:
Author: NOSK.life · Last reviewed: 2026-07-21