1. Scope and Purpose of IEC/ISO 31010

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The landscape of organizational risk management requires more than just a high-level policy. The international standard IEC/ISO 31010:2019, Risk management – Risk assessment techniques, serves as the definitive compendium of methods for conducting robust risk assessments within the framework of ISO 31000. This standard guides managers, engineers, analysts, and auditors in selecting and applying appropriate techniques to identify, analyze, and evaluate risks with a high degree of technical rigor.

1. Scope and Purpose of IEC/ISO 31010

The primary scope of IEC/ISO 31010 is to provide guidance on the selection and application of systematic techniques for risk assessment. The standard is intended to cover the entire risk assessment sub-process of the ISO 31000 framework:

• Risk Identification: Techniques for finding, recognizing, and describing risks that might help or prevent an organization from achieving its objectives (e.g., brainstorming, structured interviews, checklists, SWIFT).
• Risk Analysis: The process of comprehending the nature of risk and determining the level of risk. This includes qualitative, semi-quantitative, or quantitative approaches (e.g., consequence/probability matrices, FMEA, LOPA, FTA).
• Risk Evaluation: The process of comparing the results of risk analysis against risk criteria to determine whether the risk and/or its magnitude is acceptable or tolerable.

2. Technical Requirements and Technique Taxonomy

The core technical value of ISO 31010 is its classification of risk assessment techniques. The standard does not enforce mandatory techniques but establishes criteria for selection based on the decision context, data availability, complexity, and organizational culture.

2.1 Technique Categories

• Look-up methods: Checklists, Preliminary Hazard Analysis (PHA).
• Supporting methods: Structured interviews, Delphi technique, SWIFT (Structured What-If Technique).
• Scenario analysis: Root cause analysis, FMECA, HAZOP, HACCP.
• Functional analysis: Reliability Block Diagrams (RBD), Fault Tree Analysis (FTA), Event Tree Analysis (ETA).
• Statistical methods: Monte Carlo Simulation, Bayesian Analysis, Markov Analysis.
• Economic methods: Cost-Benefit Analysis (CBA), Value at Risk (VaR).

2.2 Selection Criteria

• The objectives of the assessment (e.g., safety, financial, operational).
• The nature and degree of uncertainty.
• The complexity of the system or problem.
• The resources, time, and expertise available.
• The ability to quantify outcomes.

Table 1: Common Techniques and Their Application Stages

3. Implementation Highlights and Workflow

Implementing the standard requires a structured, defensible workflow.

1. Context Definition: Before selecting a technique, the organization must define the external and internal context (ISO 31000, Clause 5.3). The technique must fit the scope of the risk assessment.
2. Technique Selection: Use the selection matrix in Annex A. For example, if the goal is to identify major process safety incidents, HAZOP is preferred over a generic checklist. For financial portfolio risk, VaR may be chosen.
3. Rigorous Application: The team must apply the chosen method correctly. For FTA, this means proper logic gate symbol usage (AND/OR gates) and cut set analysis. For FMEA, it means defining unambiguous ranking criteria for Severity, Occurrence, and Detection (S-O-D).
4. Documentation: The standard stresses that assumptions, limitations, uncertainties, and data sources used in the analysis must be fully documented to ensure traceability and repeatability.
5. Verification and Validation: Results should be checked for consistency. Different teams analyzing the same scenario using different techniques (e.g., FTA and Event Tree) should arrive at logically consistent conclusions.

4. Compliance Notes and Audit Readiness

While ISO 31010 is a guidance standard (not a requirements specification), its proper use demonstrates technical due diligence in risk management. Auditors assessing compliance with ISO 31000 or management system standards (e.g., ISO 9001:2015, Clause 6.1) will look for evidence of the following:

• Justification of Methodology: The organization must prove that its chosen technique is fit for purpose. Relying solely on unstructured expert judgment without a recognized structured method may be considered a gap in rigor.
• Competency: Personnel applying advanced statistical or simulation techniques (e.g., Monte Carlo, Bayesian networks, Markov chains) must have the requisite training, experience, and documented competence.
• Traceability: The risk register must clearly link the risk level (e.g., “High,” “Critical”) back to the results of a specific analysis technique (e.g., an FMEA RPN of 180 or an FTA probability of 1E-6).
• Limitations: Acknowledging the limitations of the model and the data. For instance, stating that a deterministic approach was used instead of a probabilistic one, along with the rationale behind the decision.

As organizations increasingly adopt digital risk management (RiskTech) and integrate AI into decision-making, the techniques within IEC/ISO 31010 are evolving. The standard remains the bedrock for traditional risk assessment while facilitating the move towards dynamic, real-time risk assessment models. For practitioners, mastering the taxonomy of this standard is essential for moving beyond generic compliance toward engineering resilience.