Quailty Digest Article
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Certified Quality Technician
Body of Knowledge

I. Quality Control Concepts and Techniques

    A. Total Quality Control Concepts

      1. New design control

      2. Purchased material control

      3. Product and process control

      4. Special process control

      5. Work elements of quality systems

    B. Classification of Characteristics and Nonconformances

      1. Purposes

      2. Differences

      3. When accomplished

      4. Why accomplished

    C. Determination of Inspection Points and Methods

      1. Purchased material

      2. Work in process

      3. Final inspection and test

      4. Shipping inspection

      5. Documentation methods

    D. Inspection Methods

      1. 100-percent inspection

      2. Different types and methods of sampling

      3. Nondestructive testing and examination

      4. Destructive testing

    E. Nonconforming Material Control

      1. Identification and segregation

      2. Materials review principles

      3. Dispositions

      4. Corrective action and recurrence control

    F. Quality data

      1. Purposes

      2. Uses

      3. Analysis

      4. Application to problem solving


II. Fundamentals of Practical Statistical Methods

    A. Presentation, Description and Analysis of Data

      1. Frequency distribution of data: normal, bimodal, skewed

      2. Measurement of central tendency

      3. Measurement of variation

      4. Measurement of correlation

    B. Sampling Distributions

      1. Mean

      2. Variance

      3. Proportion

      4. Range

      5. Normal

      6. Poisson

      7. Binomial

      8. Pareto


    C. Statistical inference

      1. Universe vs.  sample

      2. Parameter vs.  statistic

      3. Standard deviation

      4. Confidence level

      5. Confidence limits

      6. Precision of the estimate

      7. Producer and consumer risks

    D. Control Charts

      1. General concepts

      2. State of statistical control

      3. Control limits

      4. Precontrol

      5. Process capability

      6. Rational subgroupings

      7. Variables charting

      8. Attribute charting

      9. Machine capability

      10. Analysis of charts


III. Application of Sampling Principles

    A. Limitations and Applications

    B. Use of ANSI/ASQ ZI. 4

    C. Concept of Sampling Based on the Hypergeometric Distribution

    D. Use of Operating Characteristic Curves

    E. Alpha and Beta Risks

    F. Principles of Homogeneity

    G. Definitions and Selection of AQL, LTPD and AOQL

    H. Economics of Selection of a Sampling Plan

    I. Producer and Consumer Risks


IV. Reliability Principles, Applications and Simple Calculations

    A. Concepts

      1. Failure models

      2. Reliability prediction

      3. Mean time between failures

      4. Mean time to failure

      5. Failure rate

      6. Redundancy

      7. Probability of survival

      8. Mean time to repair


    B. Calculations

      1. MTBF

      2. MTTR

      3. MTTF


V. Metrology and Calibration Fundamentals

    A. Common International Standards of Measurement

    B. Measurement Standards and Traceability

    C. Levels of Accuracy and the Hierarchy of Standards and Instruments

    D. Definitions

      1. Accuracy

      2. Precision

      3. Repeatability

      4. Reliability

      5. Direct reading vs.  differential measurements

      6. Analog vs.  digital

    E. Control Systems

    F. Calibration Labels

    G. Calibration Error Effect on Product Acceptance

    H. MIL-STD-45662

    I. Statistical Tolerancing Measurement Uncertainties


VI. Quality Data, Analysis, Problem Solving and Cost Methodology

    A. Comparing Needs With Resources

    B. Economics of Quality Costs (Nonconformance)

      1. Prevention costs

      2. Appraisal costs

      3. Internal failure costs

      4. External failure costs

    C. Using and Analyzing Quality Cost Data

    D. Profit and Productivity Improvement by Use and Application of Quality Cost Data


VII. Quality Audit Concepts and Principles

    A. Types of Audits

    B. Audit Purposes

    C. Audit vs.  Inspection

    D. Audit Principles and Methods

    E. Audit Reporting

    F. Corrective Actions Based on Audits

    G. Methods of Audit Follow-Up and Closure

    H. Application of Statistics to Auditing


VIII.  Geometry, Trigonometry and Metric Conversion

    A. Common Formulas

    B. Problems

    C. Simple Algebra

    D. Metric Conversion Factors and Applications


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