QMS Audit Expert ISO 13485 internal audit methodology for medical device quality management systems. Table of Contents Audit Planning Workflow Audit Execution Nonconformity Management External Audit Preparation Reference Documentation Tools Audit Planning Workflow Plan risk-based internal audit program: List all QMS processes requiring audit Assign risk level to each process (High/Medium/Low) Review previous audit findings and trends Determine audit frequency by risk level Assign qualified auditors (verify independence) Create annual audit schedule Communicate schedule to process owners Validation: All ISO 13485 clauses covered within cycle Risk-Based Audit Frequency Risk Level Frequency Criteria High Quarterly Design control, CAPA, production validation Medium Semi-annual Purchasing, training, document control Low Annual Infrastructure, management review (if stable) Audit Scope by Clause Clause Process Focus Areas 4.2 Document Control Document approval, distribution, obsolete control 5.6 Management Review Inputs complete, decisions documented, actions tracked 6.2 Training Competency defined, records complete, effectiveness verified 7.3 Design Control Inputs, reviews, V&V, transfer, changes 7.4 Purchasing Supplier evaluation, incoming inspection 7.5 Production Work instructions, process validation, DHR 7.6 Calibration Equipment list, calibration status, out-of-tolerance 8.2.2 Internal Audit Schedule compliance, auditor independence 8.3 NC Product Identification, segregation, disposition 8.5 CAPA Root cause, implementation, effectiveness Auditor Independence Verify auditor independence before assignment: Auditor not responsible for area being audited No direct reporting relationship to auditee Not involved in recent activities under audit Documented qualification for audit scope Audit Execution Conduct systematic internal audit: Prepare audit plan (scope, criteria, schedule) Review relevant documentation before audit Conduct opening meeting with auditee Collect evidence (records, interviews, observation) Classify findings (Major/Minor/Observation) Conduct closing meeting with preliminary findings Prepare audit report within 5 business days Validation: All scope items covered, findings supported by evidence Evidence Collection Method Use For Documentation Document review Procedures, records Document number, version, date Interview Process understanding Interviewee name, role, summary Observation Actual practice What, where, when observed Record trace Process flow Record IDs, dates, linkage Audit Questions by Clause Document Control (4.2): Show me the document master list How do you control obsolete documents? Show me evidence of document change approval Design Control (7.3): Show me the Design History File for [product] Who participates in design reviews? Show me design input to output traceability CAPA (8.5): Show me the CAPA log with open items How do you determine root cause? Show me effectiveness verification records See references/iso13485-audit-guide.md for complete question sets. Finding Documentation Document each finding with: Requirement: [Specific ISO 13485 clause or procedure] Evidence: [What was observed, reviewed, or heard] Gap: [How evidence fails to meet requirement] Example: Requirement: ISO 13485:2016 Clause 7.6 requires calibration at specified intervals. Evidence: Calibration records for pH meter (EQ-042) show last calibration 2024-01-15. Calibration interval is 12 months. Today is 2025-03-20. Gap: Equipment is 2 months overdue for calibration, representing a gap in calibration program execution. Nonconformity Management Classify and manage audit findings: Evaluate finding against classification criteria Assign severity (Major/Minor/Observation) Document finding with objective evidence Communicate to process owner Initiate CAPA for Major/Minor findings Track to closure Verify effectiveness at follow-up Validation: Finding closed only after effective CAPA Classification Criteria Category Definition CAPA Required Timeline Major Systematic failure or absence of element Yes 30 days Minor Isolated lapse or partial implementation Recommended 60 days Observation Improvement opportunity Optional As appropriate Classification Decision Is required element absent or failed? ├── Yes → Systematic (multiple instances)? → MAJOR │ └── No → Could affect product safety? → MAJOR │ └── No → MINOR └── No → Deviation from procedure? ├── Yes → Recurring? → MAJOR │ └── No → MINOR └── No → Improvement opportunity? → OBSERVATION CAPA Integration Finding Severity CAPA Depth Verification Major Full root cause analysis (5-Why, Fishbone) Next audit or within 6 months Minor Immediate cause identification Next scheduled audit Observation Not required Noted at next audit See references/nonconformity-classification.md for detailed guidance. External Audit Preparation Prepare for certification body or regulatory audit: Complete all scheduled internal audits Verify all findings closed with effective CAPA Review documentation for currency and accuracy Conduct management review with audit as input Prepare facility and personnel Conduct mock audit (full scope) Brief personnel on audit protocol Validation: Mock audit findings addressed before external audit Pre-Audit Readiness Checklist Documentation: Quality Manual current Procedures reflect actual practice Records complete and retrievable Previous audit findings closed Personnel: Key personnel available during audit Subject matter experts identified Personnel briefed on audit protocol Escorts assigned Facility: Work areas organized Documents at point of use current Equipment calibration status visible Nonconforming product segregated Mock Audit Protocol Use external auditor or qualified internal auditor Cover full scope of upcoming external audit Simulate actual audit conditions (timing, formality) Document findings as for real audit Address all Major and Minor findings before external audit Brief management on readiness status Reference Documentation ISO 13485 Audit Guide references/iso13485-audit-guide.md contains: Clause-by-clause audit methodology Sample audit questions for each clause Evidence collection requirements Common nonconformities by clause Finding severity classification Nonconformity Classification references/nonconformity-classification.md contains: Severity classification criteria and decision tree Impact vs. occurrence matrix CAPA integration requirements Finding documentation templates Closure requirements by severity Tools Audit Schedule Optimizer

Generate optimized audit schedule

python scripts/audit_schedule_optimizer.py --processes processes.json

Interactive mode

python scripts/audit_schedule_optimizer.py --interactive

JSON output for integration

python scripts/audit_schedule_optimizer.py --processes processes.json --output json Generates risk-based audit schedule considering: Process risk level Previous findings Days since last audit Criticality scores Output includes: Prioritized audit schedule Quarterly distribution Overdue audit alerts Resource recommendations Sample Process Input { "processes" : [ { "name" : "Design Control" , "iso_clause" : "7.3" , "risk_level" : "HIGH" , "last_audit_date" : "2024-06-15" , "previous_findings" : 2 } , { "name" : "Document Control" , "iso_clause" : "4.2" , "risk_level" : "MEDIUM" , "last_audit_date" : "2024-09-01" , "previous_findings" : 0 } ] } Audit Program Metrics Track audit program effectiveness: Metric Target Measurement Schedule compliance

90% Audits completed on time Finding closure rate 95% Findings closed by due date Repeat findings <10% Same finding in consecutive audits CAPA effectiveness 90% Verified effective at follow-up Auditor utilization 4 days/month Audit days per qualified auditor