Articles

Practical techniques · Tool applications · Pitfall guides · Case studies · Data analysis · Improvement methods · Audit readiness

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📄 108 articles in total 📅 Continuously updated 🔥 Pinned first, then sorted by rating, views and publish date
Six Sigma & Statistical Quality · Six Sigma Methodology · DMAIC Project Path

Six Sigma Project Dying in the I Stage? —— A Case Study on Improvement Plan Screening and Piloting in an Electronics Company

1. Introduction: Smooth Sailing in the A Stage, Nearly Fatal in the I Stage At the beginning of 2025, an electronics man…

Six Sigma & Statistical Quality · Six Sigma Methodology · Black Belt/Green Belt Mechanism & Financial Benefits

Project "Completed," but Benefits Can't Withstand Scrutiny? — Case Analysis of a Rebuilt Six Sigma Project Closure Review System in an Equipment Manufacturing Company

Companies implementing Six Sigma generally focus their efforts on two ends: rigorous gatekeeping during project initiati…

Six Sigma & Statistical Quality · Experimentation & Robustness · DOE Basics & Advanced

Experiment Completed, but the Wrong Conclusion Was Chosen? — A Comprehensive Case Study of DOE Result Analysis in an Electronics Company

Many companies, after introducing Design of Experiments DOE , focus all their efforts on "designing the plan": how many …

Six Sigma & Statistical Quality · Measurement & Inspection · MSA & Traceability

Day Shift Release, Night Shift Return? —— Counting MSA Transforms Visual Inspection from "By Feel" to "By Standard"

1. Introduction: The Same Product, Qualified in the Morning, Unqualified in the Afternoon A certain automotive parts com…

Six Sigma & Statistical Quality · Six Sigma Methodology · DMAIC Project Path

Root Cause Identified, but the Solution Nearly Failed? —— A Case Study of a Six Sigma Improvement Project in an Automotive Parts Company

In the five stages of DMAIC, Define sets the direction, Measure provides the evidence, Analyze determines the understand…

Six Sigma & Statistical Quality · Experimentation & Robustness · DOE Basics & Advanced

Too Many Factors, Can't Afford the Tests? —— Practical Partial Factorial Design: 16 Tests to Lock Down Key Factors

In deep quality improvement efforts, almost everyone hits the same wall: there are seven or eight influencing factors, e…

Six Sigma & Statistical Quality · Six Sigma Methodology · DMAIC Project Path

Data Collected, but Root Cause Still Elusive? —— Case Study Analysis of a Breakthrough in the A Phase of a Six Sigma Project at an Automotive Parts Company

Many Six Sigma projects fail not in the measurement phase but in the analysis phase. The M phase involves meticulous dat…

Six Sigma & Statistical Quality · Six Sigma Methodology · Black Belt/Green Belt Mechanism & Financial Benefits

Black Belt Projects: The More You Do, the More You Lose — A Case Study on Rebuilding the Six Sigma Project Initiation Mechanism in an Equipment Manufacturing Company

Six Sigma has been implemented for many years in a certain equipment manufacturing company, but it often encounters an a…

Six Sigma & Statistical Quality · Experimentation & Robustness · DOE Basics & Advanced

Full Factorial Analysis Complete, but Still Can't Pin Down the Optimal Parameters? —— Five-Step Practical Approach to Response Surface Methodology (RSM)

Many quality professionals complete full factorial experiments in Design of Experiments DOE but get stuck at the final s…

Six Sigma & Statistical Quality · Six Sigma Methodology · DMAIC Project Path

Six Sigma Project Stalled in the M Stage? —— A Case Study of Data Collection Plan Rebuilding in an Automotive Parts Company

1. D Stage Passed Smoothly, but M Stage Nearly Derailed the Project An automotive parts company launched a Six Sigma pro…

Six Sigma & Statistical Quality · Statistical Process Control · Process Capability Cpk / Ppk

Cpk Only 0.82, Customer Issues an Ultimatum? — A Case Study of Process Capability Improvement in an Automotive Parts Company

1. Introduction: An Audit Report Reveals the True Picture An automotive parts company specializes in spline shafts, with…

Six Sigma & Statistical Quality · Experimentation & Robustness · DOE Basics & Advanced

Single Factor Rotation Always Fails? —— Five-Step Practical Approach to Full Factorial DOE

Many quality professionals get stuck on model selection when they start learning DOE: they know how to handle a few fact…