Hazard Control
Job Safety Analysis (JSA): A Seven-Step Guide With a Worked Example
A job safety analysis breaks a task into its steps, names the hazards in each step, and fixes a control to each hazard before the work starts. Seven steps carry it: choose the job, involve the people who do it, break the task down, identify hazards, select controls by the hierarchy, record and brief the result, then review it when the job changes.
By Matthew Hart
CEO, Soter
Written for supervisors and safety professionals who prepare task-level hazard analyses. Control adequacy for a specific site is a judgement for a competent person.
The method, and the names it goes by
A job safety analysis is a task-level document with three columns: the steps of the job in order, the hazards present in each step, and the control assigned to each hazard. OSHA publishes the method as job hazard analysis in booklet OSHA 3071. Employers say JSA, JHA, task hazard analysis, or safe work method statement depending on the industry and the country. The document is the same shape in all of them.
The value sits in the sequence. A hazard register lists what is dangerous in an area. A JSA states when in the job each hazard appears and what has to be in place at that moment. That is why it briefs well to a crew five minutes before the work starts, and why an analysis written without the people who do the job tends to miss the two or three steps where the real exposure lives.
The seven steps
Every version of the method covers the same ground. Written out explicitly, it runs like this.
- 1. Select the job. Rank candidates by incident and near-miss history, by the severity possible even without a history, by recent change, by how infrequently the job is done, and by whether it runs under a permit.
- 2. Involve the people who do it. Watch the job run. Ask what they do when the part is stuck, when the shift is short, and when the right tool is missing.
- 3. Break the task into steps. Aim for roughly eight to fifteen. Describe what is done, leaving how it is done to the control column.
- 4. Identify the hazards in each step. For each step, ask what energy is present, what could release it, and what has to fail for someone to be hurt.
- 5. Select a control for each hazard. Work down the NIOSH hierarchy of controls: elimination, substitution, engineering controls, administrative controls, then personal protective equipment.
- 6. Record and brief it. Put the analysis somewhere it can be retrieved, and walk the crew through it before the job starts.
- 7. Review on change. Re-run it when the task, equipment, materials, or environment change, and after any incident on that job.
Where a documented hazard analysis is required
No single OSHA standard requires a document called a JSA for every job. Several standards require a documented hazard analysis for specific work, and those are the ones an inspector asks for by name.
| Standard | What it requires | Documentation |
|---|---|---|
| 29 CFR 1910.132(d)(1) | Assess the workplace to determine whether hazards are present that necessitate PPE, then select and communicate the PPE | Written certification under 1910.132(d)(2) naming the workplace, the person certifying, and the date |
| 29 CFR 1910.119(e) | A process hazard analysis on processes covered by the process safety management standard | One of the named methodologies in 1910.119(e)(2), documented and prioritised |
| 29 CFR 1910.147(c)(4)(i) | Procedures for the control of hazardous energy during servicing and maintenance | Developed, documented, and used, with a narrow exception for simple single-source equipment |
| OSH Act Section 5(a)(1) | A workplace free from recognised hazards causing or likely to cause death or serious physical harm | No prescribed form; a documented analysis is how most employers show the hazard was recognised and controlled |
A JSA frequently satisfies more than one of these at once, and the overlap is worth planning for. A blade change on a slitting machine touches the energy control procedure, the PPE assessment, and the general duty. One analysis can carry all three when the record names which requirement each part answers.
A blade change, analysed
Here is the middle of a real-shaped analysis: replacing a worn circular blade on a slitting machine. The first two steps and the last two are omitted for length; these four carry the exposure.
| Step | Hazard | Control and level |
|---|---|---|
| 3. Isolate and lock out the drive and pneumatic supply | Unexpected start-up; stored pneumatic pressure in the clamp cylinder | Documented energy control procedure, both sources isolated, pressure bled and verified at the gauge, individual lock applied (administrative, backed by engineered isolation points) |
| 4. Open the guard and remove the blade retaining nut | Contact with the exposed cutting edge; nut and washer dropping into the machine bed | Blade-edge sheath fitted before the guard opens; captive tooling and a parts tray (engineering) |
| 5. Lift the blade clear and set it on the bench | Laceration during the carry; awkward reach across the machine bed | Two-person lift with the sheath left in place, blade cradle positioned within reach so the carry is under 40 cm (engineering plus administrative) |
| 6. Fit the replacement blade and torque the nut | Laceration; over-torque cracking the blade; wrong blade fitted | Sheath removed only after the blade is seated, torque wrench set and verified, part number checked against the job card (engineering plus administrative) |
Two things about this table matter more than its content. Every control names a level in the hierarchy, so a reviewer can see at a glance that step 3 leans on procedure and would benefit from a stronger interlock. And every control is a thing that can be observed on the floor. Someone can walk up and check whether the sheath is fitted, whether the torque wrench is calibrated, whether the cradle is within reach.
Three failures that hollow a JSA out
The method is simple, and it fails in predictable ways.
Controls written as exhortations. "Be careful" and "use caution" describe a state of mind. They cannot be observed, verified, or handed to the next shift. Replace each one with something physical or procedural: a sheath, an interlock, a torque setting, a second person. If you cannot say who would check it and how, it is not a control.
Steps written from the manual. An analysis built from the equipment documentation describes the job as designed. The workaround that exists because the isolation valve is stiff, the stool that gets used because the reach is too high, the step performed out of order at the end of a shift, all of that only appears when you watch the job and ask.
PPE in every row. When gloves and glasses appear as the control for every hazard, the analysis has stopped at the bottom of the hierarchy. PPE is legitimate as the last layer and as an interim measure while a stronger control is built. As the only layer, it puts the whole burden of the hazard on the person nearest to it. Our guide to the hierarchy of controls works through the levels with examples.
Key takeaways
- A JSA states the steps of a job in order, the hazards in each step, and the control assigned to each hazard.
- Build it with the people who perform the task, watching the job as it is actually done.
- Record the hierarchy level of every control so weak reliance on procedure is visible.
- Documented hazard analysis is required by name in 1910.132(d), 1910.119(e), and 1910.147(c)(4)(i).
What a JSA does not do
A completed analysis is a plan. It records no evidence that any control was implemented, that a worker was briefed, or that the control still worked a month later. The verification step belongs to the inspection and audit process, and OSHA's guidance on hazard prevention and control is explicit that controls are followed up to confirm they are effective.
A JSA also does not settle whether a control is adequate. That judgement belongs to a competent person with authority over the work and knowledge of the equipment. This article describes the method; it does not tell you whether an interlock, a permit, or a redesign is the right answer on your machine. Where the work falls under a specific standard, the standard governs, and State Plan requirements may add to it.
Where SoterAI fits
A supervisor can walk the job, describe each step aloud or record a short video of it, and have that information structured into the fields of a job safety analysis record. A qualified person then reviews the steps, hazards, and controls, corrects what the capture missed, and signs the record off before it is briefed.
Test that workflow against an analysis you have already written. Compare the step breakdown with your own, check whether each control names a level in the hierarchy, and note how much the reviewer has to correct. Then check the part that gets forgotten: whether the record can be retrieved and re-briefed when the job changes six months from now. The job safety analysis record page shows the fields a completed analysis is stored in.
Sources
- OSHA 3071: Job Hazard AnalysisOSHA's own booklet on the method, its naming, and job selection criteria.
- 29 CFR 1910.132: PPE hazard assessmentSource for the workplace hazard assessment duty and the written certification requirement.
- 29 CFR 1910.119: Process safety managementSource for the process hazard analysis requirement and its accepted methodologies.
- 29 CFR 1910.147: Control of hazardous energySource for documented energy control procedures cited in the blade-change example.
- NIOSH: Hierarchy of ControlsPrimary source for the five control levels and their order.
- OSHA: Hazard prevention and controlSupports the follow-up and verification guidance in the limits section.
See how a walked job becomes a structured, reviewable analysis. Read the job safety analysis workflow.