Tracing a Field Failure Back to the Decision That Caused It
A walk-through of a real external defect, from the warranty claim back through the containment, the inspection, and the single…
Six Sigma & Data
150 articles
Statistical Process Control: Why Most Charts Become Compliance Theatre
SPC fails not because the statistics are wrong, but because organisations treat charts as audits artifacts. Here is how to…
Process Capability Indices: What Cp and Cpk Actually Tell You About Your Process
Cp and Cpk dominate quality dashboards, but their assumptions, sample sizes, and specification origins are rarely scrutinised. Here is how…
Measurement System Analysis: Why Your Floor Data Betrays You
Most plants trust measurement systems they have never validated. Here is how unverified gage error drives scrap, false accepts, and…
The Hawthorne Effect in Manufacturing Quality: Measurement That Misleads
Observation changes behaviour. When auditors and engineers leave the floor, the numbers revert. Here is how to design quality systems…
Quality Network Effects: How Interconnected Systems Amplify Manufacturing Defects
Modern manufacturing networks amplify defects at scale. Quality leaders must map connections, install firebreaks, and measure system-level performance to prevent…
The Swiss Cheese Model and Manufacturing Escapes
Multiple quality barriers should prevent escapes. The Swiss Cheese Model reveals why they fail simultaneously under operational stress.
Pareto Analysis in Quality Management: Finding the Vital Few Defect Causes
Why most quality teams spread effort across dozens of problems instead of concentrating on the few that drive 80% of…
The Base Rate Fallacy in Quality Management: Chasing Noise Instead of Signal
Why plants mobilise cross-functional teams for statistical noise, and how forcing base rate context into escalation saves thousands of wasted…
Regression to the Mean in Manufacturing: The Cost of Rewarding Random Luck
Manufacturing plants waste millions punishing random bad luck and celebrating random good fortune. Recognising common cause variation prevents this waste.