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📄 681 articles in total 📅 Continuously updated 🔥 Pinned first, then sorted by rating, views and publish date
Measurement, Inspection & Lab · Inspection System · Full Inspection & Sampling Decisions

Why Are There Still Defects After Passing Sampling Inspection? —— A Five-Step Method to Quantify and Manage the Risk of Missed Defects

An electronics company's IQC follows the standard sampling inspection: batch size of 1000 units, general inspection leve…

Business & Enterprise Operations · Cost & Resource Management · Cost of Quality (COQ)

Rework, Scrap, or Concession? — A Five-Step Cost Decision Method for Nonconforming Products

A 40 minute MRB meeting at an automotive parts company was held to discuss a batch of 2000 injection molded parts with s…

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

Factor Selection and Level Determination in DOE: A Five-Step Method

A quality engineer at a plastic injection molding company spent three weeks conducting a round of DOE, involving three f…

People, Culture & Leadership · Culture & Behavior · Quality Culture Metrics

QM Management Depth (29) | Quality Culture Building: From Training to Behavioral Habits

1. A Beautiful Training Record Can't Stop the General Manager's Single Question A precision manufacturing company with a…

Measurement, Inspection & Lab · Inspection System · IQC/IPQC/FQC/OQC Planning

Inspector Says "I Inspected It," but Customers Get Defects — Five-Step Method to Quantify Inspection Effectiveness Using Blind Sample Challenge Tests

The quality manager of an electronics manufacturing company was pulled into a customer complaint meeting by the sales de…

Advanced Quality & R&D Quality · Design Quality · DVP/DV/PV & Validation Strategy

Advancing QE Skills (29) | Practical Weibull Analysis: Predicting Failures Using Lifespan Data

1. Handing Over 5 Failure Points to Software Yields a "Lifespan Conclusion" A batch of electric actuators from a manufac…

Advanced Quality & R&D Quality · Design Quality · Special Characteristics & Drawing Specifications

What to Do When Three Special Characteristics Lists Don't Match? —— A Five-Step Method for Compiling and Verifying the SC/CC Master List

The customer requests a special characteristics list. The quality department copies one from the drawings, the design en…

Advanced Quality & R&D Quality · Design Quality · DVP/DV/PV & Validation Strategy

Advancing QE Skills (28) | Accelerated Life Test Design: Models for Temperature, Humidity, and Vibration

1. Treating 1000 Hours at 125°C as "Equivalent to 20 Years" A manufacturing company was conducting a life test for a pro…

Supply Chain & External Provision · Supplier Strategy & Development · Access & Grading

QM Management Depth (28) | Supplier Strategic Grading: From IQC Interception to Supplier Development

1. The General Manager's One Sentence, Leaving the Quality Director Nowhere to Stand A certain electronics manufacturing…

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

GR&R Only 8%, but Customer Retest Exceeds Limits? —— Five-Step Sampling Plan for MSA

A quality engineer at a die casting company conducted a gauge repeatability and reproducibility GR&R study, calculating …

Business & Enterprise Operations · Cost & Resource Management · Cost of Quality (COQ)

Full Inspection, Increased Sampling, and Re-inspection, Yet Defects Persist — Five Steps to Diagnose Quality Cost Structure and Shift Investment from Inspection to Prevention

A monthly quality cost report for an automotive parts company sits on the general manager's desk: last year's average mo…

Advanced Quality & R&D Quality · Design Quality · DVP/DV/PV & Validation Strategy

QE Skill Enhancement (27) | Reliability Basics: Failure Rate, MTBF, and the Bathtub Curve

1. How "MTBF 50,000 Hours" Was Misinterpreted as "Can Be Used for Over 5 Years" A manufacturing company participated in …