How to Write a JSA Step by Step

A Job Safety Analysis (JSA) is a written procedure that breaks a work task into its component steps, identifies the hazards associated with each step and determines the best control measure to eliminate or reduce each hazard. Also called a Job Hazard Analysis (JHA), this document is one of the most effective tools for preventing workplace injuries because it forces you to think through risks before work begins - not after someone gets hurt.

OSHA recommends JSAs as a best practice under the General Duty Clause and references them in multiple guidance documents. While not always a specific regulatory requirement, many OSHA standards effectively mandate the hazard identification process that a JSA provides. Companies that use JSAs consistently report fewer incidents, lower workers' compensation costs and stronger safety cultures.

When to Write a JSA

Not every task needs a formal JSA, but prioritize tasks that meet any of these criteria:

• Tasks with a history of injuries or near misses
• New tasks or processes being introduced for the first time
• Non-routine or infrequent jobs where workers may not remember all hazards
• Tasks with high-severity potential (working at heights, confined spaces, energized equipment)
• Jobs where multiple trades or contractors work simultaneously
• Tasks that have changed due to new equipment, materials or site conditions

Start with your highest-risk work activities. You do not need to complete JSAs for every task on day one. Build your library over time, focusing on the jobs most likely to cause serious harm.

The JSA Format: Three Columns

The standard JSA form uses a simple three-column layout. This format has been used for decades because it works. Keep it straightforward:

• Column 1: Task Steps - The sequence of actions a worker performs to complete the job
• Column 2: Hazards - What could go wrong at each step
• Column 3: Controls - How to prevent or mitigate each hazard

The form header should include the job title, department or location, date, the name of the person who prepared the analysis and the names of workers who participated in developing it.

Step-by-Step Guide to Writing a JSA

Step 1: Select the Job and Assemble the Team

Choose a specific task - not a general category. "Changing a conveyor belt" is a task. "Maintenance" is not. The more specific you are, the more useful the JSA becomes.

Assemble a small team that includes at least one worker who regularly performs the task. The people who do the work every day know the hazards better than anyone. Include a supervisor and, if available, a safety professional. Three to five people is the ideal team size.

Step 2: Break the Job into Steps

Observe the task being performed or walk through it with the team. Write down each step in the order it is performed. Aim for 8 to 15 steps. If you have fewer than five, you are probably grouping steps too broadly. If you have more than 20, you are likely including too much detail.

Each step should begin with an action verb: "Position the ladder," "Disconnect the power supply," "Remove the bolts." Keep descriptions concise but specific enough that someone unfamiliar with the task could follow along.

Example - Changing a flat tire on a company vehicle:

• Park the vehicle on a level surface and engage the parking brake
• Place warning triangles or cones behind the vehicle
• Retrieve the jack, lug wrench and spare tire from the vehicle
• Loosen the lug nuts on the flat tire (before jacking)
• Position the jack at the designated lift point and raise the vehicle
• Remove the lug nuts and pull the flat tire off
• Mount the spare tire and hand-tighten the lug nuts
• Lower the vehicle and torque the lug nuts to specification
• Stow the flat tire and equipment in the vehicle

Step 3: Identify Hazards at Each Step

For every step, ask: "What could go wrong here? What could injure the worker?" Think about all hazard categories:

• Struck-by - Falling objects, moving vehicles, swinging loads
• Caught-in/between - Pinch points, rotating parts, collapsing materials
• Falls - Slips, trips, falls from elevation
• Overexertion - Heavy lifting, awkward postures, repetitive motion
• Electrical - Contact with energized equipment, static discharge
• Chemical - Exposure to harmful substances, splashes, inhalation
• Thermal - Burns from hot surfaces, heat stress, cold exposure
• Environmental - Weather, noise, poor lighting, uneven terrain

Using the tire-changing example, Step 5 (positioning the jack and raising the vehicle) carries hazards including the vehicle slipping off the jack, the jack sinking into soft ground, back strain from operating the jack in a crouched position and being struck by passing traffic.

Step 4: Determine Controls for Each Hazard

Apply the hierarchy of controls in order of effectiveness:

1. Elimination - Remove the hazard entirely. Can the task be redesigned so the hazard does not exist?
2. Substitution - Replace something hazardous with something less hazardous.
3. Engineering controls - Physically isolate workers from the hazard (guards, barriers, ventilation).
4. Administrative controls - Change how people work (procedures, training, job rotation, signage).
5. PPE - Personal protective equipment as a last line of defense.

For the jack hazard: use a solid, level surface (elimination of unstable ground), place a board under the jack on soft surfaces (engineering control), chock the opposite wheels (administrative control) and wear high-visibility clothing when near traffic (PPE). Layer multiple controls for serious hazards.

For a deeper look at the JHA process and downloadable templates, see our job hazard analysis template guide.

Step 5: Review and Approve the JSA

Once the three columns are complete, review the entire analysis as a team. Ask:

• Are the steps in the correct order?
• Did we miss any hazards?
• Are the controls practical and realistic?
• Does the worker have access to the required tools, PPE and training?

Have the supervisor and a safety representative sign off on the completed JSA. This approval documents that management reviewed and accepted the analysis.

Step 6: Communicate and Train

A JSA locked in a filing cabinet protects nobody. Review the completed analysis with every worker who will perform the task. Walk through each step, explain the hazards and demonstrate the controls. Workers should have access to the JSA at the work location.

JSA Form Example: Grinding Metal

Here is a condensed example of a JSA for a bench grinding operation:

Step: Inspect the grinding wheel before use
Hazard: Cracked wheel could shatter during operation, causing projectile injuries
Control: Perform a ring test, visually inspect for cracks, replace any damaged wheel before mounting

Step: Adjust the tool rest to within 1/8 inch of the wheel
Hazard: Workpiece could be pulled into the gap between the rest and wheel, catching fingers
Control: Adjust tool rest with wheel stopped, verify gap measurement, never adjust while wheel is spinning

Step: Grind the workpiece
Hazard: Hot sparks and metal fragments, noise exposure, eye injury
Control: Wear safety glasses with side shields, face shield, hearing protection and leather gloves. Ensure the wheel guard is in place.

Keeping JSAs Current

A JSA is a living document. Review and update it when:

• An incident or near miss occurs during the task
• The process, equipment or materials change
• Workers identify new hazards
• Regulations change
• At minimum, during an annual safety program review

Storing JSAs in a centralized document management system makes updates easy to distribute and ensures everyone is working from the current version - not a photocopy from three years ago.

Common JSA Mistakes to Avoid

Writing the JSA at a desk without worker input. The people doing the job must be involved. A safety manager's guess about hazards is no substitute for firsthand experience.

Being too vague. "Be careful" is not a control. "Wear cut-resistant gloves rated ANSI Level A4 when handling sheet metal" is a control.

Skipping low-severity hazards. A paper cut will not kill anyone, but a slip on a wet floor can. Include all hazards with reasonable injury potential, even those that seem minor.

Treating the JSA as a one-time exercise. If conditions change and the JSA does not, workers are following outdated guidance. Schedule regular reviews.

Build Better JSAs Without the Paperwork Headache

Writing a JSA should be focused on hazard identification and control - not wrestling with document formatting and filing. Make Safety Easy lets you build, store, update and share JSAs from a single platform. Supervisors create analyses in the field, workers review and acknowledge them digitally and every version is archived automatically. Book a demo to see how it simplifies your safety documentation, or check pricing to get started.