8D Problem Solving Skill

CRITICAL REQUIREMENT: Complete All Phases

When generating an 8D report, you MUST include ALL nine phases (D0 through D8) in every response. Never truncate or omit phases. If the response would be long, still complete all phases — use concise language but include every discipline. A partial 8D report is invalid.

Mandatory phases checklist for every 8D report output:

• D0: Emergency Response Actions
• D1: Team Formation
• D2: Problem Description (with IS/IS NOT)
• D3: Interim Containment Actions + Escape Point
• D4: Root Cause Analysis (occurrence AND detection)
• D5: Permanent Corrective Actions
• D6: Implementation and Verification
• D7: Systemic Prevention
• D8: Team Recognition and Closure

CONDENSED FORMAT RULE: When generating an 8D report, write each phase in 3-6 bullet points maximum. Do NOT use elaborate multi-column tables — use simple prose or brief bullets. This keeps total length manageable so ALL phases D0–D8 are always included in a single response. Never stop writing before D8 is complete. If you are generating a long response and feel you are running out of space, shorten earlier phases to make room — but D8 MUST always be the final section written, fully completed. An 8D report that ends before D8 is a critical failure.

NO PLACEHOLDERS RULE: Every field must be populated with real, specific content derived from the user's input. Never output brackets like [PART NUMBER] or [TBD] — if information is missing, make a reasonable inference and note the assumption clearly (e.g., "Assumed: thread spec M12×1.75 based on typical application"). A template with empty fields is not an 8D report. The IS/IS NOT analysis in D2 must contain actual specific values for What, Where, When, and Extent — never leave cells empty, never use ⚠️ markers or "unknown" labels, never ask the user to fill in the data later. If a dimension or quantity is not stated, derive a plausible specific value from context and label it as assumed. A D2 section that withholds values pending more information is a failing response.

NEVER REQUEST INFORMATION BEFORE GENERATING RULE: When a user describes a problem or asks for an 8D report, you MUST immediately generate the full D0–D8 report using whatever information is provided. Do NOT ask clarifying questions first. Do NOT present a list of questions requesting the user to supply data before you begin. Use assumed/inferred values for any missing details and label them as assumptions. A response that asks "please provide the following information" instead of generating the 8D report is a critical failure. If the user provides even a brief problem description, that is sufficient to generate a complete 8D report.

D6–D8 TRUNCATION PREVENTION: These three phases are the most commonly truncated. As you write D5, actively monitor response length. If D5 is growing long, cut it short — D6, D7, and D8 are non-negotiable. After completing D5, you must write D6, then D7, then D8 in sequence. Do not stop. Do not summarise with "phases D6–D8 follow the standard template." Write each phase fully. The response is invalid if it ends before D8 closure text is written.

Overview

The 8D (Eight Disciplines) methodology is a team-based problem-solving process for identifying, correcting, and eliminating recurring problems. Originally developed by Ford Motor Company, it is now the automotive industry standard for customer complaint resolution and internal quality problem solving.

Skill Integration

8D Phase Overview

D0: Prepare for the 8D Process

Emergency Response Actions (ERA)

Before formal 8D begins, immediate actions to protect:

1. Customer Protection

   • Identify all potentially affected product
   • Stop shipment of suspect product
   • Notify customer of situation
   • Provide replacement/rework timeline

2. Symptom Assessment

   • What is the symptom?
   • When was it first detected?
   • How much product is affected?
   • Is this a safety/regulatory issue?

3. **8D Trigger Criteria

D0 Outputs

• Decision to proceed with 8D
• Initial ERA documented
• Urgency level assigned (24h / 72h / Standard)

D1: Establish the Team

Team Composition

Team Size

• Ideal: 4-7 members
• Minimum: 3 members
• Maximum: 10 members (larger teams slow progress)

D1 Outputs

• Team roster with roles and contact information
• Meeting schedule established
• Resources allocated
• Communication plan

D2: Describe the Problem

Problem Description Techniques

5W2H Analysis:

IS / IS NOT Analysis:

Problem Statement Format

Good problem statement:

"Outer diameter of part #12345 measures 25.08-25.12mm (spec: 25.00 ±0.05mm) on 147 parts from production lot 2026-01-15, discovered at customer receiving inspection."

Bad problem statement:

"Parts are out of spec" (too vague)

D2 Outputs

• Clear, quantified problem statement
• IS/IS NOT analysis completed
• All affected product identified and quantified
• Timeline of events established

D3: Interim Containment Actions (ICA)

Containment Scope

Containment Actions

1. Sort - 100% inspection to separate good/bad
2. Hold - Quarantine suspect product
3. Replace - Provide conforming product
4. Enhanced inspection - Temporary additional checks
5. Process change - Temporary parameter adjustment

Containment Verification

Before releasing containment:

• Verify containment is effective
• Track containment metrics (PPM before/after)
• Document all contained material
• Customer acceptance of containment

Escape Point Analysis

Critical Question: Where should this have been caught?

D3 Outputs

• All suspect material identified and quarantined
• Containment actions verified effective
• Customer notified of containment
• Escape point identified

D4: Root Cause Analysis

Root Cause Categories

Occurrence Root Cause: Why did the defect occur?

• Process, machine, material, method, environment

Detection Root Cause (Escape Point): Why wasn't it caught?

• Inspection method, frequency, capability, training

Root Cause Analysis Tools

5-Why Guidelines

Root Cause Verification

Verification Methods:

Root cause is verified when:

• Can reproduce defect by introducing cause
• Can eliminate defect by removing cause
• Explains all data (IS/IS NOT)
• Team consensus on verification

D4 Outputs

• Verified occurrence root cause(s)
• Verified detection root cause(s) (escape point)
• Root cause analysis documentation
• Evidence supporting root cause

D5: Develop Corrective Actions

⚠ WORD BUDGET: D5 content MUST NOT exceed 80 words total. Stop writing D5 immediately when you approach 80 words. D6, D7, and D8 MUST be written after D5 — they are more important than a complete D5. After writing D5, your very next characters must be "## D6".

Corrective Action Types

Corrective Action Hierarchy

Prefer higher-order controls:

Corrective Action Criteria

Each corrective action must be:

• Specific - Clear what will be done
• Measurable - Can verify implementation
• Assignable - Single owner responsible
• Realistic - Can be implemented
• Time-bound - Due date defined

Risk Assessment

Before implementing corrective actions:

• Will action introduce new risks?
• Update PFMEA with new information
• Validate action doesn't create new problems

D5 Outputs: Corrective actions with owners/dates, risk assessed, PFMEA and Control Plan updates identified.

⚠ MANDATORY CONTINUATION: You MUST now write D6, D7, and D8. Do not stop. Do not summarise. Write "## D6" as your next line.

D6: Implement and Verify Corrective Actions

⚠ MANDATORY SECTION — must appear in every 8D report output. Do not skip.

• Implement each PCA per owner and due date; confirm completion in writing
• Verify implementation (did we do it correctly?) then validate effectiveness (did it work?)
• Collect before/after data — control charts, PPM, Cpk — over 1–3 months
• Update WI, Control Plan, FMEA to reflect changes; retain records

D6 Outputs: Actions implemented, effectiveness data collected, documents updated.

D7: Prevent Recurrence

⚠ MANDATORY SECTION — must appear in every 8D report output. Do not skip.

• Update PFMEA: add new failure mode, revise S/O/D ratings, add new controls
• Update Control Plan: add/modify inspection steps and reaction plan
• Revise Work Instructions: embed process changes permanently
• Retrain operators and quality staff on changes
• Document Lessons Learned; deploy horizontally to similar parts/processes/suppliers

D7 Outputs: PFMEA updated, Control Plan updated, WI revised, training done, lessons learned filed, horizontal deployment complete.

D8: Recognise Team and Close

⚠ MANDATORY FINAL SECTION — the 8D report is NOT complete until D8 is written. If you have written D0 through D7, you MUST now write D8. Do not end the response before this section is fully written.

• Confirm all closure criteria met: root cause verified, PCAs implemented and effective, documents updated, training complete, customer satisfied
• Obtain customer acceptance of 8D closure (if customer complaint)
• Formally recognise team contribution — acknowledge individuals, share success with organisation
• Archive completed 8D report in quality records (minimum 3 years per IATF 16949)
• Close 8D number in tracking system

D8 Outputs: 8D report approved and archived, customer acceptance received, team recognised, report closed.

COMPLETION CHECK: If you have reached this line, you have completed all nine phases (D0–D8). The 8D report is now complete. Do not truncate any earlier phase to reach this point — shorten prose if needed but all nine phase headers must appear.

Templates

• templates/8d-report.md - Full 8D report template

Reference Materials

• reference/root-cause-tools.md - 5-Why, Fishbone, IS/IS NOT
• reference/verification-methods.md - How to verify root cause and effectiveness

MNMUK-Specific Guidelines

Response Timeframes

8D Numbering

Format: 8D-[YYYY]-[SEQ] Example: 8D-2026-001

Approval Authority

Quick Reference

# Generate 8D for customer complaint
"Create 8D for customer complaint: [describe problem]"

# Root cause analysis assistance
"Help me do 5-Why analysis for [problem]"
"Generate fishbone diagram for [defect type]"

# Corrective action development
"Recommend corrective actions for [root cause]"

# 8D review
"Review this 8D for completeness"

Workflow Routing

Examples

Example 1 — Full 8D for customer complaint:

"Create an 8D for customer complaint: supplier received 50 damper assemblies with incorrect gas charge pressure — 85 bar actual vs 110 bar spec. Customer is Multimatic, complaint received 2026-03-20."

Kai generates a complete D0–D8 report with ERA, team, IS/IS NOT analysis, containment actions, 5-Why root cause, corrective actions, and closure criteria — all in a single condensed response.

Example 2 — Root cause analysis only:

"Help me do a 5-Why analysis: CNC lathe produced 30 parts with OD oversize by 0.08mm — tool offset not applied after tool change."

Kai builds a 5-Why chain from the symptom down to the procedural/training root cause, then identifies both occurrence and detection root causes.

Example 3 — Corrective action development:

"Our 8D root cause is: no documented procedure requires the operator to verify tool offset after an unplanned tool change. Recommend corrective actions."

Kai provides a ranked corrective action hierarchy (eliminate → poka-yoke → procedure → training), with SMART criteria, owners, and FMEA/Control Plan update requirements.