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📊 Quality Control and Quality Assurance Introduction Series v1.0

📖 Reading Time: 120-150 minutes 📊 Level: Beginner to Intermediate 💻 Code Examples: 40

Quality Control and Quality Assurance Introduction Series v1.0

Complete Practical Guide from TQM, SPC, and Six Sigma Basics to Practice

Series Overview

This series is a comprehensive 5-chapter educational content designed for progressive learning from the basics to practice of quality control and quality assurance in process industries. It comprehensively covers fundamental concepts of TQM, Statistical Process Control (SPC), Six Sigma methodologies, ISO 9001 Quality Management Systems, and data-driven quality improvement.

Features:
- ✅ Practice-Oriented: 40 executable Python code examples
- ✅ Systematic Structure: 5-chapter structure for progressive learning from basics to applications
- ✅ Industrial Applications: Real-world quality management examples from chemical plants and manufacturing processes
- ✅ Latest Technologies: Python statistical analysis, machine learning-based quality prediction

Total Learning Time: 120-150 minutes (including code execution and exercises)


Learning Approach

Recommended Learning Sequence

flowchart TD A[Chapter 1: Quality Management Basics and TQM] --> B[Chapter 2: Statistical Process Control - SPC] B --> C[Chapter 3: Six Sigma Methodology and DMAIC] C --> D[Chapter 4: ISO 9001 and QMS] D --> E[Chapter 5: Data-Driven Quality Improvement] style A fill:#e8f5e9 style B fill:#c8e6c9 style C fill:#a5d6a7 style D fill:#81c784 style E fill:#66bb6a

For Beginners (Learning quality management for the first time):
- Chapter 1 → Chapter 2 → Chapter 3 → Chapter 4 → Chapter 5
- Duration: 120-150 minutes

For Manufacturing/Quality Management Professionals (With foundational knowledge):
- Chapter 1 (Quick review) → Chapter 2 → Chapter 3 → Chapter 5
- Duration: 90-110 minutes

For Data Scientists (With statistical knowledge):
- Chapter 2 → Chapter 3 → Chapter 5
- Duration: 60-80 minutes


Chapter Details

Chapter 1: Quality Management Basics and TQM

📖 Reading Time: 25-30 minutes 💻 Code Examples: 8 📊 Difficulty: Beginner

Learning Content

  1. Basic Concepts of Quality Management
    • Definition of quality and history of quality management
    • Differences between QC, QA, and QMS
    • Process capability indices (Cp, Cpk) calculation
    • Quality cost classification and analysis
  2. TQM (Total Quality Management)
    • Eight principles of TQM
    • PDCA cycle implementation
    • Pareto analysis (80-20 rule)
    • Cause-and-effect diagram (fishbone diagram)
  3. Quality Improvement Methods
    • 5 Whys analysis
    • Defect rate calculation and confidence intervals
    • Quality metrics dashboard
    • Statistical quality evaluation basics

Learning Objectives

Read Chapter 1 →

Chapter 2: Statistical Process Control (SPC)

📖 Reading Time: 25-30 minutes 💻 Code Examples: 8 📊 Difficulty: Intermediate

Learning Content

  1. Control Chart Basics
    • X-bar and R control charts
    • p-chart (defect rate control)
    • EWMA control chart (exponentially weighted moving average)
    • CUSUM control chart (cumulative sum control chart)
  2. Process Stability Evaluation
    • Calculation of control limits (UCL, LCL)
    • Detection of special cause variation
    • Process capability analysis (Pp, Ppk)
    • Western Electric rules
  3. Application to Chemical Processes
    • Control charts for product purity
    • Reaction temperature process control
    • Quality control for batch processes

Learning Objectives

Read Chapter 2 → (In preparation)

Chapter 3: Six Sigma Methodology and DMAIC

📖 Reading Time: 25-30 minutes 💻 Code Examples: 8 📊 Difficulty: Intermediate

Learning Content

  1. Six Sigma Basics
    • What is Six Sigma (3.4 DPMO)
    • Sigma level calculation
    • Relationship between DPMO and process capability
    • Six Sigma belt system
  2. DMAIC Cycle
    • Define: Project charter, VOC analysis
    • Measure: Data collection plan, measurement system analysis
    • Analyze: Root cause analysis, hypothesis testing
    • Improve: Design of Experiments (DOE)
    • Control: Standardization, control plan
  3. Utilizing Statistical Methods
    • t-test, F-test, chi-square test
    • Regression analysis and ANOVA
    • Taguchi method

Learning Objectives

Read Chapter 3 → (In preparation)

Chapter 4: ISO 9001 and Quality Management System

📖 Reading Time: 20-25 minutes 💻 Code Examples: 8 📊 Difficulty: Beginner to Intermediate

Learning Content

  1. ISO 9001 Basics
    • Seven principles of ISO 9001:2015
    • Process approach
    • Risk-based thinking
    • Document control and record management
  2. Internal Audit and Corrective Actions
    • Internal audit plan development
    • Checklist creation
    • Nonconformance management
    • Corrective and Preventive Actions (CAPA)
  3. QMS Operation and Performance Evaluation
    • KPI setting and monitoring
    • Management review
    • Continuous improvement mechanisms

Learning Objectives

Read Chapter 4 → (In preparation)

Chapter 5: Data-Driven Quality Improvement

📖 Reading Time: 25-35 minutes 💻 Code Examples: 8 📊 Difficulty: Intermediate to Advanced

Learning Content

  1. Quality Prediction Using Machine Learning
    • Building quality prediction models
    • Defect detection models (classification problems)
    • Correlation analysis between process parameters and quality
    • Feature importance analysis
  2. Anomaly Detection and Early Warning
    • Anomaly detection using Isolation Forest
    • Process anomaly detection using Autoencoder
    • Time series anomaly detection (Prophet, STL decomposition)
    • Alert system design
  3. Quality Big Data Analysis
    • Defect pattern classification using clustering
    • Quality characteristic summarization using principal component analysis (PCA)
    • Causal inference and verification of quality improvement effects
    • Dashboard construction and real-time monitoring

Learning Objectives

Read Chapter 5 → (In preparation)


Overall Learning Outcomes

Upon completing this series, you will acquire the following skills and knowledge:

Knowledge Level (Understanding)

Practical Skills (Doing)

Application Ability (Applying)


FAQ (Frequently Asked Questions)

Q1: What level of statistics prerequisite knowledge is required?

A: Basic statistics knowledge (mean, standard deviation, normal distribution) is sufficient. Necessary statistical methods are explained carefully in each chapter and can be learned practically with Python code examples.

Q2: What is the difference between this series and the process control series?

A: While the process control series focuses on "real-time control and automation," this series focuses on "quality evaluation, management, and improvement." Combining both enables optimal operation while ensuring quality.

Q3: Can this be applied to actual manufacturing sites?

A: Yes. All code examples are designed with practical application in mind. However, during implementation, please comply with on-site safety regulations, data security, and regulatory requirements.

Q4: Which Python libraries are required?

A: We primarily use NumPy, Pandas, Matplotlib, Seaborn, SciPy, and scikit-learn. For SPC, we use statistics, and for quality prediction, we utilize machine learning libraries.

Q5: What should I learn next?

A: We recommend the following topics:
- Design of Experiments (DOE): Efficient quality improvement experiments
- Reliability Engineering: Failure rate analysis, FMEA, FTA
- Manufacturing Data Analysis: Big data, IoT, digital twin
- Lean Manufacturing: Waste elimination and efficiency improvement


Next Steps

Recommended Actions After Completing the Series

Immediate (Within 1 week):
1. ✅ Conduct process capability analysis on your company's quality data
2. ✅ Identify critical quality issues using Pareto chart
3. ✅ Create control charts and evaluate process stability

Short-term (1-3 months):
1. ✅ Launch Six Sigma improvement project
2. ✅ Introduce SPC control charts to daily operations
3. ✅ Build quality prediction model
4. ✅ Organize ISO 9001 compliant quality manual

Long-term (6 months or more):
1. ✅ Build company-wide Total Quality Management (TQM) system
2. ✅ Foster data-driven quality improvement culture
3. ✅ Build career as quality engineering specialist
4. ✅ Present at quality management conferences or write papers


Feedback and Support

About This Series

This series was created as part of the PI Knowledge Hub project under Dr. Yusuke Hashimoto at Tohoku University.

Created: October 26, 2025
Version: 1.0

We Welcome Your Feedback

To improve this series, we look forward to your feedback:

Contact: yusuke.hashimoto.b8@tohoku.ac.jp


License and Terms of Use

This series is published under CC BY 4.0 (Creative Commons Attribution 4.0 International) license.

What you can do:
- ✅ Free viewing and download
- ✅ Educational use (classes, study sessions, etc.)
- ✅ Modification and derivative works (translation, summarization, etc.)

Conditions:
- 📌 Author credit display required
- 📌 Modifications must be clearly indicated
- 📌 Please contact us in advance for commercial use

Details: CC BY 4.0 License Full Text


Let's Get Started!

Are you ready? Start from Chapter 1 and begin your journey into the world of quality control and quality assurance!

Chapter 1: Quality Management Basics and TQM →


Update History


Your quality management learning journey begins here!

References

  1. Montgomery, D. C. (2019). Design and Analysis of Experiments (9th ed.). Wiley.
  2. Box, G. E. P., Hunter, J. S., & Hunter, W. G. (2005). Statistics for Experimenters: Design, Innovation, and Discovery (2nd ed.). Wiley.
  3. Seborg, D. E., Edgar, T. F., Mellichamp, D. A., & Doyle III, F. J. (2016). Process Dynamics and Control (4th ed.). Wiley.
  4. McKay, M. D., Beckman, R. J., & Conover, W. J. (2000). "A Comparison of Three Methods for Selecting Values of Input Variables in the Analysis of Output from a Computer Code." Technometrics, 42(1), 55-61.

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