Recovering Statistical Process Control From Compliance Theatre
Why most SPC charts are decorative, how the system degrades, and the specific operational mechanisms required to make control charts…
Six Sigma & Data
150 articles
Process Capability Indices: Diagnostic Tools, Not Trophy Numbers
Cp and Cpk values are routinely computed on unstable processes, non-normal data, and unrepresentative samples. Here is how to audit…
Recovering Design for Six Sigma from Phase-Gate Bureaucracy
How to strip the paperwork out of a stalled DFSS deployment and return the methodology to its core engineering purpose:…
Scaling Statistical Tolerance Analysis Across Multi-Site Production
When production scales from a single pilot line to multiple facilities and suppliers, the statistical assumptions behind tolerance analysis break…
Measurement Systems Analysis: Why Your Gage R&R Is Lying to You
A Gage R&R under 10% means nothing if the study was rigged, the parts were hand-picked, and the instrument was…
Cost of Quality: Why the Number Nobody Believes Is the Number You Need
How to move COQ analysis from political theatre to verifiable financial decisions, using activity-based costing to expose your hidden factory.
Statistical Process Control: Why Valid Charts Become Useless Wallpaper
SPC fails not because the statistics are wrong, but because organisations confuse control limits with specification limits and operators with…
Process Capability Analysis: Why Your Cpk Study Is Probably a Fiction
Most Cpk values in PPAP packages and management dashboards are unvalidated snapshots. Here are the statistical assumptions quality engineers ignore…
Pareto Analysis: Why Your 80/20 Chart Drives Zero Corrective Action
Most manufacturing plants generate Pareto charts that simply confirm existing biases. Here is how to rebuild the 80/20 principle into…
Statistical Process Control: Why Your Control Charts Are Decoration, Not Control
Most SPC programs fail not because the statistics are wrong, but because facilities confuse specification limits with control limits and…