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…
Six Sigma & Data
133 articles
Why Design for Six Sigma Becomes Bureaucracy and How to Reclaim It
DFSS implementations frequently degrade into documentation exercises. Here is how to identify the failure points and restructure the methodology to…
Statistical Tolerance Analysis: Closing the Gap Between Calculation and Reality
Worst-case, RSS, and Monte Carlo each have a place in tolerance management. The failure mode is not picking the wrong…
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…
Acceptance Sampling: When Inspection Plans Become a Quality Strategy Nobody Questions
Most factories misuse acceptance sampling as a quality guarantee. It was built as a risk-based economic decision tool, and treating…