Job hazard analysis software › JSA vs JHA
JSA vs JHA: what's the difference?
There is no real difference. A job safety analysis (JSA) and a job hazard analysis (JHA) are the same method: break a task into steps, list the hazards of each step, and set a control for each. OSHA's own booklet is titled Job Hazard Analysis and, a few pages in, calls it a job safety analysis. The differences that matter are who writes it, how often, and whether risk gets scored.
What the letters stand for
JHA is job hazard analysis, the term in the title of OSHA publication 3071. JSA is job safety analysis. OSHA uses both: page 12 of the same booklet tells readers to consult OSHA's standards "when conducting your own job safety analysis." Queensland's mines inspectorate, in Guidance Note QGN 17 (revised October 2010), lists more versions in use, among them the job safety and environment analysis (JSEA), the task hazard analysis (THA), the safe job analysis (SJA) and the pre-work safety check, and notes that "job" and "task," "safety" and "hazard," are used interchangeably.
Some companies do draw a line. HammerTech's guide says some firms use "JSA" for the step-by-step task analysis and "JHA" for broader, project-level hazard identification. That is a house convention, not a standard, so ask which one your customer means before you rewrite anything.
The related terms, side by side
| Term | Stands for | Where you'll meet it | What is actually different |
|---|---|---|---|
| JHA | Job hazard analysis | US and Canada; OSHA 3071 | The standing analysis of one kind of work: steps, hazards, controls. Reviewed when the job changes or after an injury or illness |
| JSA | Job safety analysis | US industry, oil and gas, mining; Australia | Same method. QGN 17 quotes a definition of it as "a task oriented risk assessment which can be applied by a work team prior to undertaking a potentially hazardous activity" |
| AHA | Activity hazard analysis | Army Corps of Engineers jobs and other federal work that uses EM 385-1-1 | A stricter format: a risk assessment code (RAC) per step, plus equipment, inspection and training details. The 2024 edition of EM 385-1-1 adds a reference number for each step, hazard and control |
| PTP | Pre-task plan | US general contractors' sites | Written daily by the crew leader and crew, in the work area, for today's conditions; every crew member signs |
| THA | Task hazard analysis | Mining and industry | Another name for a JSA in QGN 17's list |
| JSEA | Job safety and environment analysis | Australian mining and resources | A JSA version that also covers environmental aspects of the task |
| FLHA | Field level hazard assessment | Canada, for example Alberta and British Columbia | Done at the job site by the crew before work, and redone when the job, task or environment changes |
| SWMS | Safe work method statement | Australia | Required for high-risk construction work under the WHS regulations, according to HammerTech's guide |
| RAMS | Risk assessment and method statement | UK and Ireland | Two documents in one: the risk assessment, plus a method statement that explains step by step how the work will be done |
A few of those rows come with law behind them. In Alberta, Part 2 of the OHS Code requires the employer to assess a work site and identify hazards before work begins, prepare a dated report of the results and controls, repeat it when a work process is introduced or changes, and involve affected workers; the FLHA is how many crews meet that in the field. A BC gravel-industry FLHA guide describes it as "similar to a Job Hazard Assessment but intended for specialized or focused tasks," done at the work site, not in the office. In the UK, the Health and Safety Executive says the Management of Health and Safety at Work Regulations 1999 require employers to identify hazards, judge the risk and eliminate or control it; the method statement half of a RAMS is the part contractors and clients add. The daily PTP is covered in its own page, Pre-task plan.
Where the difference is real
- How often. A JHA, JSA or AHA is written per task and revised when the work changes. A PTP or FLHA is written per shift. A crew that treats its JHA as a daily form ends up copying it, and a crew with only a daily form has nothing to check it against.
- Who writes it. JHAs and AHAs are usually drafted by a supervisor or safety lead, with the crew involved as OSHA 3071 asks. PTPs and FLHAs are written by the crew leader with the crew, where the work is. Layton Construction's 2025 safety plan, for instance, wants the pre-task planning meeting held in the work area when possible.
- Risk scoring. OSHA 3071 asks "how likely is it" but sets no scale, so many JHAs carry no score. An AHA does: JSABuilder's sample AHA rates each step E, H, M or L on a matrix of probability (frequent to unlikely) against severity (catastrophic to negligible), and its sample JSA shows a numeric score per step instead.
- Format. OSHA's sample form (Appendix 3 of 3071) has job title, location, analyst, date, task, hazard type and description, consequence, controls, and a rationale column. The AHA adds the RAC and the equipment, inspection and training tables. A PTP adds today's conditions, nearby trades and crew signatures.
How the software labels them
Tools don't agree on names either, which matters when a customer asks for a specific document:
- JSABuilder builds JSA, JHA and AHA worksheets, plus custom formats, from one hazard and control library, with probability-and-severity scoring.
- Gadzoom is built around the AHA for EM 385-1-1 work and says AHA and JHA are "often used interchangeably"; its 2024 post covers the new reference-number format.
- HammerTech keeps JHAs (reviewed, approved and versioned) and daily PTPs (signed by the crew) as separate, linked workflows.
- Dozer says JHA and JSA mean the same thing on site, and that the AHA is what EM 385-1-1 calls it. It drafts a daily JHA from a description of the task, with crew signatures on one phone, but it has no AHA format or risk score.
So pick the format your customer asks for, not the acronym you're used to: an AHA with a RAC for a USACE job, a daily PTP for a GC that requires one, and a JHA library for your own program. The columns of a standard JHA, and how to fill each, are on JSA template.
Questions
What does JHA stand for?
Job hazard analysis: breaking a job into steps, listing the hazards of each step and the control for each, before the work starts. OSHA's guide to it is publication 3071.
What does JSA mean?
Job safety analysis. It is the same method as a JHA, and OSHA 3071 uses both terms. Some companies use JSA for a step-by-step task analysis and JHA for broader hazard identification, but that is a house convention, not a rule.
Is an AHA the same as a JHA?
It is the same method in a stricter format. The activity hazard analysis (AHA) is what USACE's EM 385-1-1 requires on Army Corps jobs and other federal work that uses the manual. Sample AHAs, such as JSABuilder's, add a risk assessment code for each step and equipment, inspection and training details.
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