Job Hazard Analysis
5 minutes
5 Questions
Job Hazard Analysis (JHA), also called Job Safety Analysis (JSA), is a systematic technique used to identify hazards associated with a specific job task before they result in injury, illness, or property damage. Within the Associate Safety Professional (ASP) body of knowledge, JHA is a core element of hazard identification and risk assessment, and it is referenced in OSHA guidance (OSHA 3071) as a best practice for integrating safety into work procedures. The process typically follows four steps. First, select the job to analyze, prioritizing tasks with high injury frequency or severity, new or changed processes, non-routine work, or tasks complex enough that written instructions help. Second, break the job into a sequence of discrete steps, usually no more than ten, observing an experienced worker and describing what is done rather than how. Third, identify potential hazards for each step, considering energy sources (mechanical, electrical, thermal, chemical, gravity), environmental conditions, ergonomic stressors, and human factors such as fatigue. Common prompts include asking what can go wrong, what the consequences are, and what triggers the hazard. Fourth, develop controls for each hazard using the hierarchy of controls: elimination, substitution, engineering controls, administrative controls, and personal protective equipment, in that order of preference. Effective JHAs involve worker participation, since employees performing the task understand its realities and are more likely to accept controls they helped create. The completed document becomes a training tool, a basis for standard operating procedures, an incident investigation reference, and a benchmark for periodic audits. JHAs should be reviewed after incidents, near misses, process changes, or at set intervals. For the ASP exam, candidates should understand JHA terminology, the step sequence, its relationship to risk assessment matrices, and its role in a safety management system. Limitations include that JHAs address only anticipated task hazards and depend on the competence and thoroughness of those conducting them.
Job Hazard Analysis (JHA): A Complete Guide for the BCSP ASP Exam
Why Job Hazard Analysis Matters
Job Hazard Analysis (JHA), also called Job Safety Analysis (JSA) or Task Hazard Analysis, is one of the most fundamental tools in the safety professional's toolkit and a frequently tested topic on the BCSP Associate Safety Professional (ASP) exam. It sits at the intersection of hazard identification, risk assessment, and hazard control, which means questions about JHA can appear in several exam domains, including Safety Management Systems, Risk Management, and Hazard Identification and Control.
JHA matters in practice because most workplace injuries occur during routine tasks that were never systematically examined. By breaking a job into steps and asking, What could go wrong here, and how do we prevent it?, organizations move from reactive incident response to proactive prevention. OSHA strongly encourages JHAs (OSHA Publication 3071, Job Hazard Analysis), and in some standards they are effectively required, such as the hazard assessment for personal protective equipment under 29 CFR 1910.132(d), the hazard analysis requirements under Process Safety Management (1910.119), and pre-task planning in construction and confined space entry.
What a Job Hazard Analysis Is
A JHA is a structured technique that focuses on a specific job or task, breaks it into a sequence of basic steps, identifies the hazards associated with each step, and determines controls to eliminate or reduce those hazards to an acceptable level. The result is typically documented on a three- or four-column worksheet:
1. Job Step – what the worker does, in order
2. Potential Hazards – what could cause injury, illness, or loss at that step
3. Recommended Controls / Safe Procedures – how the hazard is eliminated or mitigated
4. (Often) Risk Rating – a severity and probability score before and after controls
Key terminology you should know:
• Job or task: a defined sequence of actions with a clear beginning and end (e.g., changing a grinding wheel), not an occupation or job title.
• Step: a single, distinct action within the task. A good JHA usually has roughly 5 to 15 steps. Too few hides hazards; too many makes the document unusable.
• Hazard: a condition or practice with the potential to cause harm (the source of danger).
• Risk: the combination of the probability and severity of harm from a hazard. The exam frequently tests the distinction between hazard and risk.
• Control: a measure that eliminates or reduces the risk, selected according to the hierarchy of controls.
JHA is a qualitative, task-based, inductive (bottom-up) analysis. It looks forward from each step to possible outcomes, in contrast to deductive, top-down techniques such as Fault Tree Analysis that begin with an undesired event and work backward to causes.
How a Job Hazard Analysis Works
Step 1: Select the job to analyze. Because resources are limited, prioritize jobs based on:
• High injury or illness rates, or history of near misses
• Potential for severe or fatal injury (even if incidents have not yet occurred)
• New jobs, new equipment, or changed processes (management of change)
• Jobs complex enough to require written instructions
• Infrequently performed or non-routine tasks, where familiarity is low
• Jobs involving regulatory triggers such as confined space entry, hot work, lockout/tagout, or energized electrical work
Exam note: the most important criterion is usually the potential for severe harm combined with frequency and history. If a question asks which job to analyze first, favor the one with the greatest loss potential.
Step 2: Involve the workers. The people who actually perform the task know its shortcuts, variations, and hidden hazards. Worker participation improves accuracy, builds buy-in, and is consistent with ANSI/ASSP Z10 and ISO 45001 requirements for employee participation. A JHA written solely at a desk by a supervisor or safety professional is a classic exam distractor describing poor practice.
Step 3: Break the job into basic steps. Observe the job being performed, preferably by an experienced worker under normal conditions. Record each step in sequence using concise action verbs (position ladder, open valve, lift container). Avoid two common errors: making steps too general (which hides hazards) or too detailed (which creates an unmanageable document). Review the list with the worker to confirm it is accurate.
Step 4: Identify hazards for each step. For every step ask systematic questions: What can go wrong? What are the consequences? How could it happen? What are the contributing factors? How likely is it? Consider all energy sources and hazard categories: mechanical (struck-by, caught-in, pinch points), gravity (falls, falling objects), electrical, thermal, chemical, pressure, ergonomic (force, posture, repetition), noise, radiation, biological, and environmental. Also consider the hazards created by abnormal or upset conditions, not just normal operation. Many practitioners use a checklist or the energy source approach to make sure nothing is overlooked.
Step 5: Evaluate risk. Many organizations add a risk matrix to rank each hazard by probability and severity. This supports prioritization and demonstrates due diligence. The ANSI/ASSP Z590.3 Prevention through Design standard and ANSI B11.0 both describe risk assessment approaches that integrate with JHA.
Step 6: Determine controls using the hierarchy of controls. This is the most heavily tested element. The hierarchy, from most to least effective, is:
1. Elimination – remove the hazard entirely
2. Substitution – replace with something less hazardous
3. Engineering controls – isolate people from the hazard (guards, ventilation, interlocks)
4. Administrative controls – change the way people work (procedures, training, rotation, warning signs)
5. Personal protective equipment – protect the worker at the point of contact
A well-written JHA states controls specifically (wear cut-resistant gloves rated ANSI A4, not be careful). Vague instructions like use caution are not controls and are commonly presented as incorrect answer choices.
Step 7: Implement, communicate, and train. The completed JHA becomes the basis for a safe work procedure. It should be used to train new workers, refresh experienced workers, conduct pre-task briefings, and support observations and audits.
Step 8: Review and revise. A JHA is a living document. It should be reviewed periodically (commonly annually), after any incident or near miss involving the task, whenever equipment, materials, personnel, or the environment change, and whenever an observation reveals the procedure is not being followed as written. An outdated JHA can create a false sense of security.
Benefits and Uses of JHA
• Identifies hazards before incidents occur
• Provides a foundation for written safe work procedures and training
• Supports PPE hazard assessments required by OSHA
• Serves as a tool for incident investigation, by comparing what happened to what the JHA prescribed
• Improves communication between workers, supervisors, and safety staff
• Demonstrates due diligence and supports compliance
• Can be used for pre-task planning on construction sites and in maintenance activities
Limitations
• It is qualitative and depends heavily on the knowledge and effort of the team
• It analyzes one task at a time and may miss interactions between simultaneous jobs
• It can become a paperwork exercise if not actively used and updated
• It tends to focus on acute injury hazards and may underrepresent long-latency health hazards and system-level organizational causes
Related Techniques You Should Be Able to Distinguish
• Preliminary Hazard Analysis (PHA): early, broad analysis of a system or design before details are known
• Failure Mode and Effects Analysis (FMEA): component-focused, inductive analysis of how each component can fail
• Fault Tree Analysis (FTA): deductive, top-down logic diagram starting from an undesired event
• HAZOP: team-based, guide-word analysis of process deviations, used mainly in chemical process industries
• What-If / Checklist: brainstorming approach often used in PSM
• Energy Trace and Barrier Analysis (ETBA): traces energy flows and barriers that should prevent unwanted energy transfer
JHA is distinguished by being task- and worker-focused rather than equipment- or system-focused.
Exam Tips: Answering Questions on Job Hazard Analysis
1. Know the sequence cold. Select the job, involve workers, break it into steps, identify hazards per step, determine controls, implement and train, review and revise. Questions often ask what should be done first or next. Breaking the job into steps comes before identifying hazards; identifying hazards comes before selecting controls.
2. Apply the hierarchy of controls strictly. When asked for the best or most effective control, choose the option highest on the hierarchy that is feasible. PPE and warning signs are almost never the best answer unless the question states that higher-level controls are infeasible or asks for an interim measure.
3. Watch for the hazard-versus-risk distinction. A hazard is a source of potential harm; risk incorporates probability and severity. If a question asks you to rank or prioritize, it is asking about risk.
4. Worker involvement is always correct. Any answer that excludes the people doing the work, or that relies solely on a desk review, is a distractor.
5. Remember what triggers a JHA review. New equipment, new process, new materials, an incident or near miss, a change in personnel or environment, and a scheduled periodic review. If a scenario describes a change, the expected answer usually involves updating the JHA.
6. Recognize common quality errors. Steps too broad, hazards described generically, controls stated vaguely (be careful), and documents filed away and never used. Questions may describe a JHA and ask what is wrong with it.
7. Prioritize jobs by severity potential. When choosing which task to analyze first, select the one with the highest potential for serious injury, especially if it also has a history of incidents or is new or infrequently performed.
8. Connect JHA to regulations and standards. Know that OSHA 1910.132(d) requires a documented PPE hazard assessment, that PSM requires process hazard analysis, and that ANSI/ASSP Z10 and ISO 45001 require hazard identification and worker participation. JHA is a common method for satisfying these.
9. Distinguish JHA from other analysis methods. If a question describes starting from a top event and working backward, that is FTA, not JHA. If it describes guide words such as more, less, none, that is HAZOP. If it describes a sequence of worker actions with hazards and controls for each, that is JHA.
10. Read the question stem for qualifiers. Words like first, best, most effective, least effective, and primary purpose change the correct answer. The primary purpose of a JHA is to identify hazards and establish controls before work is performed, not to assign blame or satisfy paperwork requirements.
Sample Practice Question
A safety professional is developing a JHA for a task involving the manual transfer of solvent from a drum to a smaller container. After breaking the task into steps and identifying splash and inhalation hazards during the pouring step, which control should be recommended first?
A. Require chemical splash goggles and nitrile gloves
B. Post a warning sign at the transfer station
C. Install a closed-loop drum pump with local exhaust ventilation
D. Train workers on proper pouring technique
Answer: C. The closed-loop pump and local exhaust ventilation are engineering controls that isolate the worker from the hazard, ranking above administrative controls (B and D) and PPE (A) on the hierarchy of controls. PPE and training may still be included as supplementary measures, but the exam expects you to select the highest feasible level first.
Summary
Job Hazard Analysis is a systematic, worker-involved, step-by-step method for identifying hazards in a task and selecting controls according to the hierarchy of controls. For the ASP exam, master the sequence of the JHA process, the criteria for selecting jobs to analyze, the hierarchy of controls, the triggers for review, and the distinctions between JHA and other hazard analysis techniques. When in doubt, choose the answer that is proactive, involves workers, is specific, and controls the hazard as close to the source as possible.
Job Hazard Analysis (JHA), also called Job Safety Analysis (JSA) or Task Hazard Analysis, is one of the most fundamental tools in the safety professional's toolkit and a frequently tested topic on the BCSP Associate Safety Professional (ASP) exam. It sits at the intersection of hazard identification, risk assessment, and hazard control, which means questions about JHA can appear in several exam domains, including Safety Management Systems, Risk Management, and Hazard Identification and Control.
JHA matters in practice because most workplace injuries occur during routine tasks that were never systematically examined. By breaking a job into steps and asking, What could go wrong here, and how do we prevent it?, organizations move from reactive incident response to proactive prevention. OSHA strongly encourages JHAs (OSHA Publication 3071, Job Hazard Analysis), and in some standards they are effectively required, such as the hazard assessment for personal protective equipment under 29 CFR 1910.132(d), the hazard analysis requirements under Process Safety Management (1910.119), and pre-task planning in construction and confined space entry.
What a Job Hazard Analysis Is
A JHA is a structured technique that focuses on a specific job or task, breaks it into a sequence of basic steps, identifies the hazards associated with each step, and determines controls to eliminate or reduce those hazards to an acceptable level. The result is typically documented on a three- or four-column worksheet:
1. Job Step – what the worker does, in order
2. Potential Hazards – what could cause injury, illness, or loss at that step
3. Recommended Controls / Safe Procedures – how the hazard is eliminated or mitigated
4. (Often) Risk Rating – a severity and probability score before and after controls
Key terminology you should know:
• Job or task: a defined sequence of actions with a clear beginning and end (e.g., changing a grinding wheel), not an occupation or job title.
• Step: a single, distinct action within the task. A good JHA usually has roughly 5 to 15 steps. Too few hides hazards; too many makes the document unusable.
• Hazard: a condition or practice with the potential to cause harm (the source of danger).
• Risk: the combination of the probability and severity of harm from a hazard. The exam frequently tests the distinction between hazard and risk.
• Control: a measure that eliminates or reduces the risk, selected according to the hierarchy of controls.
JHA is a qualitative, task-based, inductive (bottom-up) analysis. It looks forward from each step to possible outcomes, in contrast to deductive, top-down techniques such as Fault Tree Analysis that begin with an undesired event and work backward to causes.
How a Job Hazard Analysis Works
Step 1: Select the job to analyze. Because resources are limited, prioritize jobs based on:
• High injury or illness rates, or history of near misses
• Potential for severe or fatal injury (even if incidents have not yet occurred)
• New jobs, new equipment, or changed processes (management of change)
• Jobs complex enough to require written instructions
• Infrequently performed or non-routine tasks, where familiarity is low
• Jobs involving regulatory triggers such as confined space entry, hot work, lockout/tagout, or energized electrical work
Exam note: the most important criterion is usually the potential for severe harm combined with frequency and history. If a question asks which job to analyze first, favor the one with the greatest loss potential.
Step 2: Involve the workers. The people who actually perform the task know its shortcuts, variations, and hidden hazards. Worker participation improves accuracy, builds buy-in, and is consistent with ANSI/ASSP Z10 and ISO 45001 requirements for employee participation. A JHA written solely at a desk by a supervisor or safety professional is a classic exam distractor describing poor practice.
Step 3: Break the job into basic steps. Observe the job being performed, preferably by an experienced worker under normal conditions. Record each step in sequence using concise action verbs (position ladder, open valve, lift container). Avoid two common errors: making steps too general (which hides hazards) or too detailed (which creates an unmanageable document). Review the list with the worker to confirm it is accurate.
Step 4: Identify hazards for each step. For every step ask systematic questions: What can go wrong? What are the consequences? How could it happen? What are the contributing factors? How likely is it? Consider all energy sources and hazard categories: mechanical (struck-by, caught-in, pinch points), gravity (falls, falling objects), electrical, thermal, chemical, pressure, ergonomic (force, posture, repetition), noise, radiation, biological, and environmental. Also consider the hazards created by abnormal or upset conditions, not just normal operation. Many practitioners use a checklist or the energy source approach to make sure nothing is overlooked.
Step 5: Evaluate risk. Many organizations add a risk matrix to rank each hazard by probability and severity. This supports prioritization and demonstrates due diligence. The ANSI/ASSP Z590.3 Prevention through Design standard and ANSI B11.0 both describe risk assessment approaches that integrate with JHA.
Step 6: Determine controls using the hierarchy of controls. This is the most heavily tested element. The hierarchy, from most to least effective, is:
1. Elimination – remove the hazard entirely
2. Substitution – replace with something less hazardous
3. Engineering controls – isolate people from the hazard (guards, ventilation, interlocks)
4. Administrative controls – change the way people work (procedures, training, rotation, warning signs)
5. Personal protective equipment – protect the worker at the point of contact
A well-written JHA states controls specifically (wear cut-resistant gloves rated ANSI A4, not be careful). Vague instructions like use caution are not controls and are commonly presented as incorrect answer choices.
Step 7: Implement, communicate, and train. The completed JHA becomes the basis for a safe work procedure. It should be used to train new workers, refresh experienced workers, conduct pre-task briefings, and support observations and audits.
Step 8: Review and revise. A JHA is a living document. It should be reviewed periodically (commonly annually), after any incident or near miss involving the task, whenever equipment, materials, personnel, or the environment change, and whenever an observation reveals the procedure is not being followed as written. An outdated JHA can create a false sense of security.
Benefits and Uses of JHA
• Identifies hazards before incidents occur
• Provides a foundation for written safe work procedures and training
• Supports PPE hazard assessments required by OSHA
• Serves as a tool for incident investigation, by comparing what happened to what the JHA prescribed
• Improves communication between workers, supervisors, and safety staff
• Demonstrates due diligence and supports compliance
• Can be used for pre-task planning on construction sites and in maintenance activities
Limitations
• It is qualitative and depends heavily on the knowledge and effort of the team
• It analyzes one task at a time and may miss interactions between simultaneous jobs
• It can become a paperwork exercise if not actively used and updated
• It tends to focus on acute injury hazards and may underrepresent long-latency health hazards and system-level organizational causes
Related Techniques You Should Be Able to Distinguish
• Preliminary Hazard Analysis (PHA): early, broad analysis of a system or design before details are known
• Failure Mode and Effects Analysis (FMEA): component-focused, inductive analysis of how each component can fail
• Fault Tree Analysis (FTA): deductive, top-down logic diagram starting from an undesired event
• HAZOP: team-based, guide-word analysis of process deviations, used mainly in chemical process industries
• What-If / Checklist: brainstorming approach often used in PSM
• Energy Trace and Barrier Analysis (ETBA): traces energy flows and barriers that should prevent unwanted energy transfer
JHA is distinguished by being task- and worker-focused rather than equipment- or system-focused.
Exam Tips: Answering Questions on Job Hazard Analysis
1. Know the sequence cold. Select the job, involve workers, break it into steps, identify hazards per step, determine controls, implement and train, review and revise. Questions often ask what should be done first or next. Breaking the job into steps comes before identifying hazards; identifying hazards comes before selecting controls.
2. Apply the hierarchy of controls strictly. When asked for the best or most effective control, choose the option highest on the hierarchy that is feasible. PPE and warning signs are almost never the best answer unless the question states that higher-level controls are infeasible or asks for an interim measure.
3. Watch for the hazard-versus-risk distinction. A hazard is a source of potential harm; risk incorporates probability and severity. If a question asks you to rank or prioritize, it is asking about risk.
4. Worker involvement is always correct. Any answer that excludes the people doing the work, or that relies solely on a desk review, is a distractor.
5. Remember what triggers a JHA review. New equipment, new process, new materials, an incident or near miss, a change in personnel or environment, and a scheduled periodic review. If a scenario describes a change, the expected answer usually involves updating the JHA.
6. Recognize common quality errors. Steps too broad, hazards described generically, controls stated vaguely (be careful), and documents filed away and never used. Questions may describe a JHA and ask what is wrong with it.
7. Prioritize jobs by severity potential. When choosing which task to analyze first, select the one with the highest potential for serious injury, especially if it also has a history of incidents or is new or infrequently performed.
8. Connect JHA to regulations and standards. Know that OSHA 1910.132(d) requires a documented PPE hazard assessment, that PSM requires process hazard analysis, and that ANSI/ASSP Z10 and ISO 45001 require hazard identification and worker participation. JHA is a common method for satisfying these.
9. Distinguish JHA from other analysis methods. If a question describes starting from a top event and working backward, that is FTA, not JHA. If it describes guide words such as more, less, none, that is HAZOP. If it describes a sequence of worker actions with hazards and controls for each, that is JHA.
10. Read the question stem for qualifiers. Words like first, best, most effective, least effective, and primary purpose change the correct answer. The primary purpose of a JHA is to identify hazards and establish controls before work is performed, not to assign blame or satisfy paperwork requirements.
Sample Practice Question
A safety professional is developing a JHA for a task involving the manual transfer of solvent from a drum to a smaller container. After breaking the task into steps and identifying splash and inhalation hazards during the pouring step, which control should be recommended first?
A. Require chemical splash goggles and nitrile gloves
B. Post a warning sign at the transfer station
C. Install a closed-loop drum pump with local exhaust ventilation
D. Train workers on proper pouring technique
Answer: C. The closed-loop pump and local exhaust ventilation are engineering controls that isolate the worker from the hazard, ranking above administrative controls (B and D) and PPE (A) on the hierarchy of controls. PPE and training may still be included as supplementary measures, but the exam expects you to select the highest feasible level first.
Summary
Job Hazard Analysis is a systematic, worker-involved, step-by-step method for identifying hazards in a task and selecting controls according to the hierarchy of controls. For the ASP exam, master the sequence of the JHA process, the criteria for selecting jobs to analyze, the hierarchy of controls, the triggers for review, and the distinctions between JHA and other hazard analysis techniques. When in doubt, choose the answer that is proactive, involves workers, is specific, and controls the hazard as close to the source as possible.
Test mode:
ASP - Job Hazard Analysis Example Questions
Test your knowledge of Job Hazard Analysis
Question 1
Which characteristic best sets job hazard analysis apart from other hazard and risk analysis methods?
Question 2
A job hazard analysis (JHA) team is drafting the procedure for cleaning residue from a mixing tank. They find that confined space entry hazards appear in nearly every step: oxygen deficiency, solvent vapor, engulfment and agitator contact. The plant manager wants controls listed against each step so the JHA can be finalized. Based on standard JHA guidance for developing solutions, which recommendation should the safety specialist make FIRST?
Question 3
At which point does job hazard analysis provide its greatest preventive value for a given task?
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