Facilitator guide
Case objectives, demonstration plans, debriefs, common mistakes and application checks across all 81 workplace cases and method lessons.
Download Facilitator guide PDF · 166 pages · 65.1 MBQuality control and dependable evidence
Understand how the methods relate before selecting a detailed lesson.. Follow the visual, practise a decision, then check your thinking.
Fictional teaching examples and AI-generated illustrations. Proposed changes and goals are not achieved results. Use the written instructions and check local conditions before applying a method.
Build a dependable quality-control system
Quality control connects a requirement to an executable routine. Define the characteristic and risk, then establish whether the measurement method can support the intended decision. A control plan names how evidence is collected and who reacts. Time-ordered data may support statistical monitoring, but chart limits do not replace engineering or customer specifications. A signal requires the agreed response, containment where appropriate and verification of restoration. Feed learning into the risk analysis, control plan and training. The map is an introductory relationship model, not a licensed control-plan form or authority to approve product.
Follow the method
- Requirements and risks: What must be achieved; what can fail
- Trust the measurement: Definition, method and suitable measurement system
- Define the control: Characteristic, method, frequency and owner
- Observe the process: Time order and appropriate chart or record
- Recognize a signal: Distinguish statistical signals from specification failure
- Contain and respond: Follow the defined reaction and authority
- Verify restoration: Check process condition and affected output
- Learn and maintain: Update risk, control and training evidence
Read the example carefully
Control limits describe process behavior; specification limits express requirements.
Choose a chart from data type and sampling structure.
Containment, correction and verified recurrence prevention are different decisions.
Try it before revealing the answer
A chart is stable but measurements exceed a specification. Can the team release the product because the chart is in control?
Reveal the answer and reasoning
No. Statistical stability and conformity answer different questions. Follow product disposition and the control-plan reaction while investigating capability and relevant causes.
From a measurement question to a statistical response
A statistical routine starts with a decision question, not with a favorite chart. Define what is measured, what constitutes a unit or defect and which denominator is relevant. Check the measurement system and preserve collection order and sampling structure. Measured variables and attribute counts require different chart families; even within counts, nonconforming units and nonconformities are different data. Match the chart to these definitions and its assumptions. Agree the signal rules and reaction owner before using it. Capability asks whether a stable process can meet requirements under a suitable model. A chart does not establish conformity, capability or a cause merely by being drawn.
Follow the method
- Decision question: What needs to be learned or controlled?
- Operational definition: Unit, characteristic and opportunity
- Measurement system: Method, reference and agreement
- Sampling structure: Time order and rational grouping
- Measured variables: Individuals or subgroups
- Attribute counts: Units or nonconformities; denominator
- Appropriate chart: Match data, assumptions and sampling
- Signal response: Defined owner, evidence and action
- Capability question: Stable process and suitable model first
Read the example carefully
Nonconforming units differ from numbers of nonconformities.
Subgroup structure and time order matter to interpretation.
Capability interpretation requires stability and an appropriate distribution/model; a histogram alone is insufficient.
Try it before revealing the answer
The same unit can contain several scratches, and inspected surface area varies. Why is a fixed-size defective-unit chart not automatically appropriate?
Reveal the answer and reasoning
Clarify whether the decision counts scratched units or individual scratches. For nonconformities, preserve the exposure denominator and evaluate a suitable rate chart and assumptions. Do not select a chart from the word defect alone.
Connect risk analysis to a working station control
Risk analysis should connect the process function to plausible failure modes, effects and causes. Prevention and detection have different roles: preventing incorrect assembly differs from detecting it and stopping release. Translate the selected controls into an executable plan with a method, frequency, owner, record and reaction. Then observe whether the station actually uses the current control. A layered process audit checks execution of critical controls; it does not replace product verification. When an abnormality occurs, protect affected output, restore the process under the defined authority and verify the effect. Feed evidence back to both the risk analysis and the control plan.
Follow the method
- Process and requirement: Know the function and expected result
- Failure chain: Effect, mode and possible cause
- Prevention design: Reduce likelihood at the source
- Detection design: Expose a failure or abnormal condition
- Control plan: Method, frequency, owner and record
- Station execution: Use the current control in real work
- Reaction and containment: Respond to abnormal evidence
- Verify and learn: Confirm effectiveness and update controls
Read the example carefully
A detection-and-stop device is not the same as error prevention.
FMEA prioritization depends on the required method; no rating or Action Priority tables are reproduced.
An audit completion mark is not product-release evidence.
Try it before revealing the answer
A sensor detects reversed parts but the line continues and no owner handles the alert. Which link is missing?
Reveal the answer and reasoning
The detection is not connected to an effective reaction and release boundary. Define the stop or hold response, responsible owner, restoration verification and record; then test the complete control, not only the sensor.
Sources and further reading
- AIAG/Plexus: APQP and control plan overview ↗
Control plans link process risks and controls, with explicit reaction ownership, containment and return-to-control actions.
Public overview only. Do not reproduce licensed forms or infer a universal sampling frequency or safe-launch exit period. - NIST: Control chart families ↗
Chart selection distinguishes measured variables, attributes and multivariate statistics.
Public primary-source summary; underlying paid standards/forms are not reproduced. - NIST: Attributes charts ↗
Nonconforming units differ from counts of nonconformities; p, c and u charts address different data definitions.
Public primary-source summary; underlying paid standards/forms are not reproduced. - NIST: What are control charts? ↗
Control charts follow a statistic in time, using limits derived from a reference process; nonrandom patterns can matter even within limits.
Public primary-source summary; underlying paid standards/forms are not reproduced. - NIST: Stable but unacceptable processes ↗
Statistical stability does not imply acceptable output; reducing common-cause variation requires process improvement.
Public primary-source summary; underlying paid standards/forms are not reproduced. - NIST: Out-of-control response ↗
A signal calls for the process-specific out-of-control action plan and investigation of an assignable cause.
Public primary-source summary; underlying paid standards/forms are not reproduced. - NIST: Gauge R&R ↗
Measurement characterization covers repeatability, reproducibility, stability, bias, resolution, linearity and other error sources.
Public primary-source summary; underlying paid standards/forms are not reproduced. - NIST: Gauge study design ↗
A measurement study needs considered choices of artifacts, operators, gauges and measurement levels.
Public primary-source summary; underlying paid standards/forms are not reproduced. - ASQ: Attribute agreement analysis scope ↗
Attribute agreement examines within-appraiser, between-appraiser and reference-standard agreement.
Only the public scope is used; no ISO/TR14468 tables or examples are copied and current standard adoption is not inferred. - NIST: Process capability ↗
Capability compares a stable process distribution with specification limits; common indices require explicit distribution and sampling assumptions.
Public primary-source summary; underlying paid standards/forms are not reproduced. - AIAG/VDA FMEA release ↗
The harmonized method uses seven steps and Action Priority instead of RPN-based prioritization.
Do not copy rating/AP tables or invent AP from RPN. Confirm the method required by the customer. - LEI: Error-Proofing ↗
Prevent wrong/missing/reversed parts or prevent their passing downstream
Method reference; original OPEX scenario and diagram are synthetic teaching content, not source case results. - AIAG: Layered process audits CQI-8 ↗
Process-specific checks, cross-functional ownership and management review connect audits to meaningful performance outcomes.
Public primary-source summary; underlying paid standards/forms are not reproduced.
Take the lesson into your team.
Read the lessons online or use these PDFs to prepare, practise and review with your team. No sign-in needed.
Learner workbook
Printable case worksheets, blank observation records and five calculation exercises; answers are separate.
Download Learner workbook PDF · 169 pages · 10.7 MBAnswer key and coaching notes
Reasoned sample responses, worked calculations and coaching guidance; fictional examples are clearly labelled.
Download Answer key and coaching notes PDF · 105 pages · 8.5 MBMethod and application reference
The native method mechanisms and worked applications for all 68 detailed lessons, in a separate bookmarked portrait reference.
Download Method and application reference PDF · 141 pages · 10.2 MBIllustrated systems atlas
Five illustrated system chapters: 15 Flare concept maps and 26 original workplace teaching cards, with links to all 81 supporting cases and method lessons.
Download Illustrated systems atlas PDF · 69 pages · 55.8 MBPractise the methods in this system.
- Connect requirements, measurement, process controls and verified response.
- Choose trustworthy data and a suitable monitoring method before interpreting signals.
- Trace a failure risk into prevention, detection, reaction and verified effectiveness.
Jidoka and andon: detect, respond, verify restart
Primary teaching mechanism belongs to quality control and dependable evidence. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Poka-yoke: prevention versus detection
Primary teaching mechanism belongs to quality control and dependable evidence. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Select a chart from the data and sampling plan
Primary teaching mechanism belongs to quality control and dependable evidence. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Separate control limits from specifications
Primary teaching mechanism belongs to quality control and dependable evidence. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Read spread before the subgroup average
Primary teaching mechanism belongs to quality control and dependable evidence. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Monitor one reading at a time
Primary teaching mechanism belongs to quality control and dependable evidence. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Chart nonconforming units with the right denominator
Primary teaching mechanism belongs to quality control and dependable evidence. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Chart nonconformities per exposure
Primary teaching mechanism belongs to quality control and dependable evidence. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Respond to a signal with a defined owner
Primary teaching mechanism belongs to quality control and dependable evidence. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Check stability before capability
Primary teaching mechanism belongs to quality control and dependable evidence. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Separate part variation from measurement variation
Primary teaching mechanism belongs to quality control and dependable evidence. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Check inspection agreement and escape risk
Primary teaching mechanism belongs to quality control and dependable evidence. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Link a process risk to an executable control plan
Primary teaching mechanism belongs to quality control and dependable evidence. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Make the station check and reaction inseparable
Primary teaching mechanism belongs to quality control and dependable evidence. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Build PFMEA from a failure chain to verified action
Primary teaching mechanism belongs to quality control and dependable evidence. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Use APQP gates to expose launch risk early
Primary teaching mechanism belongs to quality control and dependable evidence. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Distinguish PPAP evidence from production authorization
Primary teaching mechanism belongs to quality control and dependable evidence. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Trace one suspect lot through split, merge and rework
Primary teaching mechanism belongs to quality control and dependable evidence. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Audit whether critical controls are actually followed
Primary teaching mechanism belongs to quality control and dependable evidence. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Control special processes through qualified conditions and records
Primary teaching mechanism belongs to quality control and dependable evidence. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Prepare a Nadcap audit with scope-linked evidence
Primary teaching mechanism belongs to quality control and dependable evidence. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Locate the applicable automotive requirements
Primary teaching mechanism belongs to quality control and dependable evidence. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Distinguish a feedback controller from statistical monitoring
Primary teaching mechanism belongs to quality control and dependable evidence. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Connect calibration to a defensible measurement result
Primary teaching mechanism belongs to quality control and dependable evidence. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Make the welding bay ready to work
Primary teaching mechanism belongs to quality control and dependable evidence. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →5 Whys with evidence and alternative branches
Primary teaching mechanism belongs to problem solving and verified change. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Choose a problem-solving approach
Primary teaching mechanism belongs to problem solving and verified change. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →From broad complaint to a testable problem
Primary teaching mechanism belongs to problem solving and verified change. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Conflict cloud: challenge assumptions
Primary teaching mechanism belongs to problem solving and verified change. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Choose the quality tool for the question
Primary teaching mechanism belongs to problem solving and verified change. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Record defects without changing the denominator
Primary teaching mechanism belongs to problem solving and verified change. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Rank problems on one declared basis
Primary teaching mechanism belongs to problem solving and verified change. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →See the distribution without losing the sequence
Primary teaching mechanism belongs to problem solving and verified change. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Test a relationship without declaring a cause
Primary teaching mechanism belongs to problem solving and verified change. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Unmix the data before blaming a shift
Primary teaching mechanism belongs to problem solving and verified change. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Turn fishbone branches into testable hypotheses
Primary teaching mechanism belongs to problem solving and verified change. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Close an NCR with verified action against recurrence
Primary teaching mechanism belongs to problem solving and verified change. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Stop the recurring leak
Primary teaching mechanism belongs to problem solving and verified change. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Make referrals ready
Primary teaching mechanism belongs to problem solving and verified change. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Send the right shipment
Primary teaching mechanism belongs to problem solving and verified change. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Make the morning easier
Primary teaching mechanism belongs to problem solving and verified change. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Shine and sustain: evidence over time
Primary teaching mechanism belongs to equipment wellness and oee. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Operator care and specialist maintenance
Primary teaching mechanism belongs to equipment wellness and oee. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Planned maintenance: criticality to verified return
Primary teaching mechanism belongs to equipment wellness and oee. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →OEE loss waterfall with denominator discipline
Primary teaching mechanism belongs to equipment wellness and oee. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →Quality maintenance: control conditions, not just inspect output
Primary teaching mechanism belongs to equipment wellness and oee. Supporting links identify application dependencies; they do not make the methods interchangeable.
Explore the connected method →