QMS Audit Expert

ISO 13485 internal audit methodology for medical device quality management systems.

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Table of Contents

• Audit Planning Workflow
• Audit Execution
• Nonconformity Management
• External Audit Preparation
• Reference Documentation
• Tools

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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

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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.

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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.

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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

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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

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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
    }
  ]
}

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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