Competent Person, Qualified Person, and Authority Boundaries
Key Takeaways
- A competent person must be capable of identifying existing and predictable hazards and must have authority to take prompt corrective action.
- A qualified person has recognized ability, knowledge, training, education, or experience to solve or design around a specific technical problem.
- The same employee may be competent for one activity and not competent or qualified for another.
- Authority boundaries matter: a CHST should know when to stop work, escalate, document, or defer to engineering, manufacturer, or regulatory direction.
- Exam questions often reward the answer that uses the correct person for the decision instead of assigning specialized decisions to whoever is nearby.
Competent Person, Qualified Person, and Authority Boundaries
Why These Terms Matter
Construction standards use person-based authority because some decisions cannot be made safely by a generic supervisor or a checklist alone. A competent person is generally someone who can identify existing and predictable hazards in the surroundings or working conditions and has authorization to take prompt corrective measures. A qualified person is generally someone who, by degree, certificate, professional standing, extensive knowledge, training, or experience, can solve or resolve problems related to a specific subject, work, or project. The exam may not ask for a word-for-word definition, but it will test whether you can send the decision to the right level of authority.
These roles are task-specific. A superintendent may be a competent person for excavation inspections but not qualified to design a complex scaffold, approve crane assembly engineering, or evaluate a damaged fall arrest system. A professional engineer may be qualified to design a protective system but may not be the on-site competent person responsible for daily inspection and removal of workers from hazardous conditions. Titles do not automatically create authority.
Competent Person in the Field
A competent person is often needed where conditions change quickly: excavations, scaffolds, fall protection planning, ladders, cranes and rigging activities, confined spaces, demolition, steel erection, concrete operations, and certain health hazards. The key exam phrase is authority to take prompt corrective action. If a person can identify a hazard but cannot stop work, remove employees, tag equipment, correct the condition, or require escalation, that person may be knowledgeable but is not functioning as the competent person required for that task.
| Scenario | Correct authority signal | Weak answer |
|---|---|---|
| Water enters a trench | Competent person reinspects and removes workers if needed | Continue because inspection was done in the morning |
| Scaffold plank is damaged | Competent person tags, removes, or restricts use | Let workers decide whether it feels stable |
| Confined space conditions change | Authorized competent or entry authority reevaluates controls | Rely on yesterday's permit |
| Fall arrest gear is loaded in a fall | Remove from service and follow competent or manufacturer evaluation | Put it back if it looks clean |
Qualified Person Decisions
Qualified person decisions involve specialized technical judgment. Examples include designing certain scaffold components, engineered excavation protective systems, fall protection anchorage or rescue systems in some cases, crane assembly or modification issues, and structural support decisions. The qualified person may be an engineer, manufacturer representative, specialist, or trained expert depending on the standard and problem. The CHST should not overclaim this role.
A common exam trap is assigning a design decision to a competent person when the scenario requires a qualified person. Competent persons inspect, recognize, and act within their assigned scope. Qualified persons solve technical problems within their expertise. Both may be required on the same activity. For example, a qualified person may design a fall protection system while a competent person ensures workers use it correctly and removes damaged components from service.
CHST Authority and Limits
A CHST may have authority to recommend controls, conduct inspections, stop unsafe work under company policy, coordinate training, review documents, and escalate issues. But the CHST should not approve a deviation from a standard, alter equipment contrary to a manual, stamp an engineering design, interpret medical restrictions beyond qualifications, or override an authority having jurisdiction. Ethical practice includes knowing when to say, This decision requires the competent person, qualified person, manufacturer, engineer, or current standard.
When boundaries are unclear, use a conservative decision path:
- Stop or isolate the exposure if workers are at immediate risk.
- Identify what decision is required: inspection, design, operation, medical, environmental, or regulatory interpretation.
- Match the decision to the required person or authority.
- Document the condition, person contacted, interim controls, and final decision.
- Communicate the outcome to affected workers before work resumes.
Exam Lens
Scenario questions often include tempting answers such as retrain the worker, tell the foreman, or proceed under observation. Those may be incomplete when the standard requires a competent person inspection or qualified person design. The best answer usually recognizes the role named or implied by the hazard. If a trench changes after rain, choose competent person reinspection. If a scaffold needs custom design, choose qualified person or engineer review. If equipment instructions are unclear, consult the manufacturer before modification or use. If a permit or plan controls the work, follow and update the current plan.
The goal is not to memorize every place these words appear. The goal is to apply authority correctly. A CHST protects workers by putting decisions in the hands of people who are authorized, capable, and accountable for that specific hazard.
A trench was inspected at 7:00 a.m., but heavy rain occurred at noon before workers reentered. What is the best action?
Which statement best distinguishes a qualified person from a competent person?
A supervisor wants to modify a manufacturer's anchor device to fit a unique steel member. What should the CHST recommend?