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Risk Assessment and Hierarchy of control



Risk assessment is a systematic process of identifying, evaluating, and controlling hazards to minimize the likelihood and impact of potential harm to people, property, or the environment. It is a fundamental component of safety management and is used across industries to ensure compliance with regulations, protect workers, and prevent accidents.


Purpose of Risk Assessment

  • To identify potential hazards in the workplace or environment.

  • To evaluate the risks associated with those hazards.

  • To implement control measures to eliminate or reduce risks.

  • To ensure compliance with legal and regulatory requirements.

  • To promote a culture of safety and proactive risk management.


Steps in the Risk Assessment Process

  1. Identify Hazards:

    • Look for anything that could potentially cause harm (e.g., chemicals, machinery, electrical systems, ergonomic issues).

    • Methods: Workplace inspections, reviewing incident reports, consulting employees, and analyzing processes.

  2. Determine Who Might Be Harmed and How:

    • Identify the people at risk (e.g., employees, contractors, visitors, the public).

    • Consider how they might be exposed to the hazard (e.g. direct contact, inhalation, repetitive motion).

  3. Evaluate the Risks:

    • Assess the likelihood of the hazard causing harm.

    • Determine the severity of the potential consequences (e.g. minor injury, major injury, fatality).

    • Use a risk matrix to prioritize risks (e.g. low, medium, high).

  4. Implement Control Measures:

    • Apply the hierarchy of controls to eliminate or reduce risks:

      1. Elimination: Remove the hazard entirely.

      2. Substitution: Replace the hazard with something less dangerous.

      3. Engineering Controls: Isolate people from the hazard (e.g. guards, barriers).

      4. Administrative Controls: Change work practices (e.g. training, signage, policies).

      5. Personal Protective Equipment (PPE): Provide protective gear (e.g. gloves, helmets).

    • Ensure controls are practical, effective, and sustainable.

  5. Record Findings:

    • Document the hazards, risks, and control measures.

    • Communicate the results to relevant stakeholders (e.g., employees, management).

  6. Monitor and Review:

    • Regularly review the risk assessment to ensure it remains up to date.

    • Update the assessment when new hazards are introduced or processes change.


Risk Assessment Tools and Techniques

  • Risk Matrix: A visual tool to evaluate and prioritize risks based on likelihood and severity.

  • Checklists: Predefined lists to ensure all potential hazards are considered.

  • SWOT Analysis: Identifies strengths, weaknesses, opportunities and threats related to risks.

  • FMEA (Failure Modes and Effects Analysis): Analyzes potential failures in a system and their impacts.


Examples of Risk Assessment

  1. Workplace Safety:

    • Hazard: Slippery floors.

    • Risk: Employees slipping and injuring themselves.

    • Control: Install anti-slip mats, clean spills immediately, and post warning signs.

  2. Construction Site:

    • Hazard: Falling from heights.

    • Risk: Workers falling from scaffolding.

    • Control: Use guardrails, safety harnesses and provide training.

  3. Chemical Handling:

    • Hazard: Exposure to toxic chemicals.

    • Risk: Workers developing health issues.

    • Control: Use fume hoods, provide PPE and implement safe handling procedures.


Legal and Regulatory Requirements

  • Many countries have laws requiring risk assessments in workplaces (e.g. OSHA in the U.S., Health and Safety at Work Act in the UK).

  • Standards like ISO 45001 (Occupational Health and Safety) provide frameworks for risk assessment and management.


Benefits of Risk Assessment

  • Prevents accidents, injuries, and illnesses.

  • Reduces costs associated with incidents (e.g. medical expenses, downtime).

  • Improves compliance with safety regulations.

  • Enhances employee morale and productivity.

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