10.2 Interviewing Techniques for Workers & Management

10.2 Interviewing Techniques for Workers & Management

Lead Auditor Core Concept: Documented procedures reflect how an organization intends work to be done; interviews reveal how work is actually executed. Under ISO 19011:2018 Clause 6.4.7 and Annex A.17, interviewing is a structured elicitation methodology. In an ISO 45001 audit, interviewing non-managerial workers carries legal and normative significance under Clause 5.4 (Consultation and participation of workers) to verify that safety culture permeates frontline operations.

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1. Normative Principles of Audit Interviewing (ISO 19011 Annex A.17)

Audit interviews gather evidence across diverse functions and organizational tiers, fulfilling three primary objectives:

1. Verify Competence & Awareness (Clauses 7.2 & 7.3): Confirm workers understand task hazards, operational controls, and their right to remove themselves from imminent danger.
2. Evaluate Leadership Commitment (Clause 5.1): Determine whether executive leadership integrates OH&S into strategic business decisions and actively supports safety initiatives.
3. Validate Worker Participation (Clause 5.4): Verify non-managerial workers are actively consulted on hazard identification, operational changes, and incident investigations without fear of reprisal.

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2. Hierarchical Interviewing Protocols Across Organizational Tiers

An auditor dynamically adapts questioning style, tone, and evidence focus based on the interviewee's role:

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3. The Lead Auditor Questioning Taxonomy

ISO 19011 Annex A.17 emphasizes using a balanced mix of questioning techniques to navigate audit trails effectively:

1. Open Questions (Exploration & Process Mapping)

Open questions encourage interviewees to describe processes in their own words, beginning with How, What, Tell me about, or Describe.

2. Closed Questions (Factual Verification)

Closed questions prompt specific factual data (yes, no, a date, a number, or an ID). Use sparingly to confirm specific facts.

3. Probing Questions (Root Cause & Tracing)

Probing questions follow up on initial responses to examine technical depth, procedural consistency, or potential breakdowns.

4. Hypothetical Scenario Questions (Competence & Emergency Testing)

Hypothetical questions evaluate hazard perception, emergency awareness, and decision-making under realistic conditions.

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4. Active Listening, Gemba Dynamics & Overcoming Worker Apprehension

Lead Auditors must establish psychological safety during frontline worker interviews:

• Audit the System, Not the Person: Begin disarmingly: "I am evaluating system tools, training, and equipment, not grading you personally."
• Interview in the Gemba: Conduct worker interviews at their workstations or benches, never in executive boardrooms.
• Active Listening & Neutrality: Maintain eye contact, avoid defensive body language, allow pauses, and paraphrase to ensure mutual understanding.
• Countering Supervisory Interference: Managers often attempt to answer for workers. Intervene politely: "Thank you, John. I need to hear directly from Maria to understand daily operations. Could you please allow us privacy?"
• Language Barriers: Use accredited neutral interpreters (Clause 6.2.4). Use plain language without jargon, and ask workers to demonstrate inspections physically.

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5. Corroborating Statements via Evidence Triangulation

Under ISO 19011 Clause 6.4.7, verbal statements alone do not constitute verifiable audit evidence. Assertions must be corroborated through evidence triangulation across three sources: verbal statements, physical observation, and documented records.

Triangulation in Practice: If an operator states that emergency eyewashes are tested weekly, but the physical inspection tag is blank for two months and the valve is seized, the verbal assertion is uncorroborated. The auditor raises a nonconformity under Clauses 8.1.1 and 9.1.1 based on physical facts.

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6. Real-World Audit Scenario: The Forklift Bypass

Audit Context: During a Stage 2 warehouse audit, Lead Auditor David investigates mobile equipment controls and worker participation (Clauses 5.4 and 8.1).

Investigation & Triangulation:

1. David approaches a forklift operator. The superintendent jogs over, claiming drivers never experience safety issues.
2. David requests five minutes of private discussion with the operator while inspecting the vehicle. The superintendent steps away.
3. In private, the operator confides that the mast tilt cylinder has leaked for two weeks. When reported on the checklist, the supervisor ordered him to ignore the defect to meet shipment quotas.
4. Verification: David inspects the mast; fresh hydraulic oil is actively dripping. The checklist shows a "Fail" box marked over with correction fluid and overwritten with a "Pass" initialed by the supervisor.
5. Outcome: David issues a Major Nonconformity under Clause 8.1.1 (Operational Planning & Control), Clause 7.3 (Awareness), and Clause 5.4 (Worker Participation).

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7. Common Exam Traps and Candidate Errors

• Trap 1: Issuing Nonconformities on Verbal Hearsay Alone. Findings must be substantiated with verifiable facts, record IDs, and observed physical conditions.
• Trap 2: Interviewing Only Salaried Management. Auditing only managers violates ISO 45001 Clause 5.4. Frontline non-managerial workers must be sampled directly.
• Trap 3: Conducting Interrogations Rather than Inquiries. Aggressive questioning creates fear and conceals hazards. Auditing is an open evaluation of system effectiveness.
• Trap 4: Allowing Management to Pre-Select Worker Interviewees. Pre-selected interviewees produce a biased sample. Auditors must independently select workers randomly on the shop floor.