9 Common JSA Mistakes (and How to Fix Them)

The most common JSA mistakes are the ones that make a form look finished while it protects no one: copied hazards, vague controls like "be careful," no rating after controls, and signatures collected after the work is under way. Each one is easy to spot once you know what it looks like, and each has a simple fix. Here are nine, with what each looks like on a real jobsite and what to do about it.

1. A Copy-Paste JSA

What it looks like: The same hazards, word for word, on the trenching JSA, the roofing JSA, and the one for last month's job at a different address. The site name is the only thing that changed, and sometimes not even that.

The fix: Write each JSA from the actual job. Walk the work area, note what is specific to it (the overhead line along the east fence, the soft ground by the downspout, the second crew working below), and put those in the hazards. In JSA Generator the AI drafts the steps, hazards, and controls from the work activity you pick. That draft is a starting point. A supervisor edits every hazard, control, and note to match the job, and adds the site address and emergency contact before finalizing.

2. Missing or Merged Job Steps

What it looks like: A single line reading "Perform work," or one step covering "set up, excavate, install pipe, backfill." Hazards that live in the middle of the task, such as the moment a load is lifted or a trench is entered, never get named.

The fix: Break the task into steps in the order they happen, small enough that each step has its own hazards. A good test: could a new worker follow the steps and know what to do next? Our guide to writing a JSA walks through a filled-in example.

3. "Be Careful" Controls

What it looks like: Controls such as "use caution," "be aware of surroundings," "stay alert," or "follow safe practices." They sound reasonable and tell the worker nothing to do.

The fix: Write controls as something a person can do and a supervisor can check: "Barricade the swing radius of the excavator before any worker enters it." "Test the circuit with a voltage tester before touching it." If you cannot say who does what and when, it is not yet a control.

4. No Hierarchy of Controls

What it looks like: Every hazard is controlled with PPE and a toolbox talk, the last two rungs on the ladder, because they are the easy ones to write.

The fix: Work through the hierarchy in order for each step: can the hazard be eliminated, can something safer be substituted, can an engineering control (a guardrail, a barrier, a guard) protect everyone, and only then administrative controls and PPE. When a higher-level control is not practical, say why. The AI draft in JSA Generator is prompted to apply the hierarchy of controls in order for every step and to state when elimination or substitution is not reasonably practicable, rather than making a control up to fill a level. Check that reasoning against your site, since you know it better than a draft does.

5. Hazards Listed Without a Control

What it looks like: A thorough hazard column and a thin control column, with rows where the control is blank or says "see above." The form names the danger and then leaves it there.

The fix: Read down the page row by row. Every hazard needs at least one control, and every control should connect to a specific hazard. Before you finalize, make this the last check you do, since it is the one most easily missed after a long edit.

6. Risk Rated Once, With No Residual Rating

What it looks like: A hazard is rated "High" and the form stops there. Nobody can tell whether the controls brought the risk down, or whether the work should have started at all.

The fix: Rate each hazard twice: before controls, and again after the controls you have chosen. In JSA Generator each hazard gets a probability and severity, and the result is banded Low, Medium, High, or Extreme. The residual rating is scored from its own probability and severity, because a guardrail makes a fall less likely but a fall would still be serious. If the residual rating is still High or Extreme, the plan is not finished. Add or strengthen a control, or change the method, before work starts. The hazard scoring and risk matrix guide explains the ratings in detail.

7. Unsigned or Partially Signed Forms

What it looks like: A crew of eight and three signatures. Or a clean form with no signatures at all, filed to satisfy a paperwork request.

The fix: Make signing part of the briefing, and compare the names to your headcount. With QR sign-off, each crew member scans the code on the finalized PDF with their own phone, enters their name and company, and signs on screen, and each signature is stored with the name and time. Our guide on how to get a crew to sign a JSA covers the routine in detail.

8. A JSA Written After the Work Started

What it looks like: The form is completed at lunch, or at the end of the day, and describes work that has already happened. The dates and signatures give it away.

The fix: Finish the JSA before the crew starts the task. The point of a job safety analysis is to think through the hazards before anyone is exposed to them. A form written after the fact documents nothing useful and, if something went wrong earlier, it will not help anyone, including you. If the work cannot wait for a full JSA, stop long enough to write a short one for the first steps and revise as you go.

9. Never Revised When Conditions Change

What it looks like: The same JSA, signed daily for three weeks, while the trench got deeper, a second crew moved in above, and the weather turned. The form describes a job that no longer exists.

The fix: Treat a change in task, hazard, location, crew, or conditions as a reason to revise before work continues. In JSA Generator, edit the JSA and finalize it again. Re-finalizing keeps the same JSA, uses none of your allowance, and issues a new sign-off code; anyone scanning the old code is told the JSA has been updated and to ask the supervisor for the new one. See daily vs task-specific JSAs for a decision rule on when to revise and when to review and re-sign.

A Quick Pre-Finalize Check

1. Is every step small enough to have its own hazards?
2. Does every hazard have a specific control a person can carry out?
3. Did you work down the hierarchy of controls, and explain where you could not?
4. Is the residual rating Low or Medium, or has the plan been strengthened?
5. Is the JSA finished before the crew starts, with a plan for signatures?

None of this makes a JSA required by OSHA, which does not mandate one by name. Employers do have to instruct employees in recognizing and avoiding unsafe conditions (29 CFR 1926.21(b)(2)), and a well-built JSA helps you document how you did that.

Frequently Asked Questions

What is the biggest mistake people make on a JSA?

Treating it as paperwork. A generic, copied, or after-the-fact JSA is a form without a plan behind it. Writing it from the actual job, before the work, is the single change that matters most.

Is it a mistake to use an AI-drafted JSA?

Not if you edit it. A draft saves the blank-page work, but it does not know your site. Review every hazard and control, add what is specific, and take out anything that does not apply.

How many hazards should a JSA list?

As many as the task has, step by step. There is no right number. Too few usually means merged steps, and too many generic hazards usually means copied text.

Who should review a JSA before the crew signs it?

At minimum the foreman or supervisor who will lead the work. For higher-risk tasks, have the competent person for the hazard, such as for excavation or scaffolds, read it before the briefing.

Fix One JSA This Week

Take your most-used JSA, check it against the five questions above, and finalize the improved version. The first finalized JSA each month is free (1 a month on the Free plan), and the plans are on the pricing page.