# A3criticalthinking Majiayu000 > A3 Critical Thinking - Skill: `diegosouzapw/a3criticalthinking-majiayu000` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add diegosouzapw/a3criticalthinking-majiayu000` - Raw SKILL.md: https://api.skillmd.com/api/skills/diegosouzapw/a3criticalthinking-majiayu000/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: diegosouzapw (https://skillmd.com/u/diegosouzapw) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/diegosouzapw/a3criticalthinking-majiayu000 --- # A3 Critical Thinking ## When to Activate This Skill - "Create an A3 for [problem]" - "Help me think through [decision]" - "Root cause analysis for [issue]" - "What should take priority here?" - "Is this safe to proceed?" - "Evaluate tradeoffs for [options]" - "5 Whys analysis" - "Fishbone diagram for [defect]" --- ## The Priority Hierarchy **Every decision must pass through this filter, in order:** ``` ┌─────────────────────────────────────────────────────┐ │ 1. SAFETY FIRST │ │ Will anyone be harmed? Stop everything else. │ │ • Employee safety │ │ • Customer safety (product in use) │ │ • Environmental safety │ │ • Community safety │ └─────────────────────────────────────────────────────┘ ↓ Only if SAFE ┌─────────────────────────────────────────────────────┐ │ 2. CUSTOMER VALUE │ │ Does this create good products for customers? │ │ • Quality that meets/exceeds requirements │ │ • Reliability and durability │ │ • On-time delivery │ │ • Fitness for purpose │ └─────────────────────────────────────────────────────┘ ↓ Only if QUALITY assured ┌─────────────────────────────────────────────────────┐ │ 3. SHAREHOLDER VALUE │ │ Now optimize for business results │ │ • Cost efficiency │ │ • Productivity │ │ • Return on investment │ │ • Growth and sustainability │ └─────────────────────────────────────────────────────┘ ``` **Critical Rule:** Never sacrifice a higher priority for a lower one. A cost saving that compromises safety is NEVER acceptable. A delivery acceleration that reduces quality is NEVER acceptable. --- ## The Decision Test Before any significant decision, apply this test: ### Question 1: Is it SAFE? - Could this harm employees, customers, or the environment? - Are all safety controls in place? - Have we identified and mitigated risks? - If NO: **STOP. Address safety first.** ### Question 2: Does it serve the CUSTOMER? - Will product quality be maintained or improved? - Does this meet customer specifications? - Will delivery commitments be met? - If NO: **STOP. Find an alternative that protects quality.** ### Question 3: Is it EFFICIENT? - Only after safety and quality are assured, optimize for: - Cost reduction - Cycle time improvement - Resource utilization - Profitability --- ## A3 Problem Solving Framework The A3 is a single-page structured approach to problem solving: ``` ┌─────────────────────────────────────────────────────────────────┐ │ TITLE: [Problem Name] DATE: │ │ OWNER: [Named Individual] REV: │ ├─────────────────────────────────────────────────────────────────┤ │ 1. BACKGROUND/CONTEXT │ 2. CURRENT CONDITION │ │ │ │ │ Why is this problem important?│ What is actually happening? │ │ What triggered this A3? │ Data, facts, observations │ │ Business impact │ Process map of current state │ │ │ Quantify the gap │ ├───────────────────────────────┼──────────────────────────────────┤ │ 3. TARGET CONDITION/GOAL │ 4. ROOT CAUSE ANALYSIS │ │ │ │ │ What should be happening? │ 5 Whys │ │ Specific, measurable target │ Fishbone/Ishikawa │ │ Timeline for achievement │ Data analysis │ │ │ Verified root cause(s) │ ├───────────────────────────────┴──────────────────────────────────┤ │ 5. COUNTERMEASURES │ │ │ │ # │ Action │ Owner │ Due Date │ Status │ │ 1 │ │ │ │ │ │ 2 │ │ │ │ │ │ 3 │ │ │ │ │ ├──────────────────────────────────────────────────────────────────┤ │ 6. IMPLEMENTATION PLAN │ 7. FOLLOW-UP/RESULTS │ │ │ │ │ Gantt or timeline │ Verification data │ │ Resources required │ Before/after comparison │ │ Risks and mitigation │ Lessons learned │ │ │ Horizontal deployment? │ └───────────────────────────────┴──────────────────────────────────┘ ``` --- ## Root Cause Analysis Tools ### 5 Whys Method Keep asking "Why?" until you reach the root cause (typically 5 levels): ``` Problem: Machine stopped producing Why? → Fuse blew Why? → Motor overheated Why? → Bearing failed Why? → Lubrication insufficient Why? → No preventive maintenance schedule ROOT CAUSE: Missing PM program for bearings ``` **Rules:** - Each "Why" must be factual, not assumed - Verify each level before proceeding - May branch into multiple root causes - Stop when you reach something you can control ### Fishbone (Ishikawa) Diagram Categorize potential causes: ``` Man Machine Material \ | / \ | / \ | / ─────────[EFFECT]───────── / | \ / | \ / | \ Method Measurement Environment ``` **Manufacturing Categories:** - **Man/People:** Training, skills, fatigue, following procedures - **Machine:** Equipment condition, calibration, capability - **Material:** Specifications, supplier quality, storage - **Method:** Procedures, work instructions, sequence - **Measurement:** Gages, accuracy, repeatability - **Environment:** Temperature, humidity, cleanliness, lighting --- ## Countermeasure Hierarchy When developing solutions, prefer higher levels: | Level | Type | Description | Example | |-------|------|-------------|---------| | 1 | **Eliminate** | Remove the possibility entirely | Design out the feature | | 2 | **Substitute** | Replace with inherently safer/better | Different material | | 3 | **Engineer** | Physical barriers or controls | Interlock, guard | | 4 | **Administrate** | Procedures, training | Work instruction | | 5 | **PPE/Inspect** | Last resort protection | Check, verify | **Rule:** Never rely solely on administrative controls for safety-critical issues. --- ## Quick Decision Framework For rapid decisions under pressure: ``` ┌─────────────────────────────────────────────┐ │ STOP AND ASK │ ├─────────────────────────────────────────────┤ │ S - Safety: Is anyone at risk? │ │ T - Target: What are we trying to achieve? │ │ O - Options: What choices do we have? │ │ P - Priority: Safety → Quality → Cost │ └─────────────────────────────────────────────┘ ``` If uncertain about safety: **STOP PRODUCTION** until verified safe. --- ## Integration Points ### With AutomotiveManufacturing Skill - A3 links to PFMEA updates when new failure modes identified - Countermeasures cascade to Work Instructions - Control Plans updated based on A3 findings ### With HoshinKanri Skill - Red bowling chart items trigger A3 - A3 countermeasures become improvement priorities - Completed A3s document breakthrough achievements ### With Quality Systems (IATF 16949) - A3 satisfies 10.2 Nonconformity and Corrective Action - Links to 8D methodology for customer complaints - Supports Management Review inputs --- ## Templates Available | Template | Purpose | Location | |----------|---------|----------| | A3 Template | Standard problem solving | `templates/a3-template.md` | | Quick A3 | Simplified one-pager | `templates/quick-a3.md` | | 5 Whys | Root cause worksheet | `templates/5-whys.md` | | Fishbone | Ishikawa diagram | `templates/fishbone.md` | | Decision Matrix | Weighted option comparison | `templates/decision-matrix.md` | | Priority Check | Safety-Quality-Cost verification | `templates/priority-check.md` | --- ## Common Mistakes to Avoid 1. **Jumping to Solutions** - Do root cause analysis first 2. **Blaming People** - Look at systems and processes 3. **Stopping at Symptoms** - Dig deeper with 5 Whys 4. **No Verification** - Confirm countermeasures worked 5. **Ignoring the Hierarchy** - Never shortcut Safety → Quality → Cost 6. **No Horizontal Deployment** - Share learnings across similar processes 7. **Paper Exercise** - A3 must drive real action --- ## Key Principles 1. **Go See (Genchi Genbutsu)** - Observe the actual condition yourself 2. **Facts Over Opinions** - Base analysis on data and evidence 3. **Respect for People** - Solutions should support workers, not blame them 4. **PDCA Cycle** - Plan-Do-Check-Act is embedded in the A3 5. **One Problem, One Owner** - Named individual accountability 6. **Visual Thinking** - Use diagrams, charts, photos 7. **Priority Discipline** - Safety → Customer → Shareholder, always --- ## Extended Context For detailed methodologies and advanced techniques: `read ~/.claude/skills/A3CriticalThinking/CLAUDE.md` For templates: `ls ~/.claude/skills/A3CriticalThinking/templates/`