Module 4 · Lesson 22 of 22
Analyze tollgate and garment defect exercise
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Learning objectives
- Assemble the Analyze tollgate evidence pack.
- Answer gate questions with process and data evidence.
- Bridge confirmed Xs to Improve experimentation.
Required evidence
- Cause inventory, fishbone, Five Whys, C&E matrix, FMEA.
- Stratified graphs, chosen tests and models with CIs.
- Assumptions, mechanism explanation, alternative-explanation check.
- Evidence table and prioritised vital Xs.
Garment-factory example
Measurement-repair variation is explained by tape condition, inspector and fabric construction; controlled tape replacement plus calibrated fixtures deliver a testable Improve pilot.
Method
- Compile the pack against the checklist.
- Present with sponsor and process owner.
- Log gaps that require additional data or pilot design.
- Approve the vital few Xs for Improve.
Common mistakes
- Equating p < 0.05 with root-cause proof.
- Proposing solutions before cause confirmation.
Knowledge check
Pick one answer per question. Explanations appear after you submit.
1. The Analyze tollgate approves Improve when:
2. Non-causes uncovered during Analyze should be:
Author: NOSK.life · Last reviewed: 2026-07-21