AHA vs JHA vs JSA: Which One Does Your Contract Require?

Short answer

What is the difference between an AHA, a JSA, and a JHA?

They are the same analytical method under three names: break the task into steps, identify hazards, assign controls. JHA (Job Hazard Analysis) is OSHA's term, JSA (Job Safety Analysis) is the common industry synonym, and AHA (Activity Hazard Analysis) is the term used on federal and USACE work under EM 385-1-1, which adds required fields such as competent person, training, and inspection requirements. Choose the name your client's contract uses, and make sure the required fields for that format are present.

Governing requirement: OSHA Publication 3071; EM 385-1-1

These three terms get thrown around interchangeably, and most of the time people mean roughly the same thing: breaking a job down into steps, identifying the hazards in each step, and defining the controls. But they aren't perfectly identical, and the differences matter when a client, a contract, or a prequalification reviewer asks for one by name.

Job Hazard Analysis (JHA) — the most general term, and OSHA's preferred one. You take a task, break it into its basic steps, identify the hazard in each step, and specify how it's controlled. It's the foundational document, applicable across almost any trade or task.

Job Safety Analysis (JSA) — in practice, essentially the same tool as a JHA. The naming is largely regional and organizational preference; many employers say JSA where others say JHA, and the structure is the same step/hazard/control breakdown. If a client asks for a JSA and you have a JHA, you're usually looking at the same document by a different name — but it's worth matching the term they use.

Activity Hazard Analysis (AHA) — this is the one that's genuinely distinct. The AHA is the format specified for federal and U.S. Army Corps of Engineers work under EM 385-1-1. It's more structured than a typical JHA — it ties in required inspections, training, and competent/qualified personnel for the activity, and it's expected in a specific form on those contracts. If you're doing government or Corps work, "AHA" is not just a synonym; it's a required deliverable in a required format.

Not sure which format your work points to? Run the free Readiness Check — it maps your activities to the hazard-analysis and written-program documentation they call for. Free, no login.

AHA vs JHA vs JSA, side by side

	JHA	JSA	AHA
Full name	Job Hazard Analysis	Job Safety Analysis	Activity Hazard Analysis
What drives it	OSHA's recommended practice for task-level hazard assessment; no single standard names the document itself	The same practice under an older, widely used industry name	EM 385-1-1, on US Army Corps of Engineers and many federal contracts
Format expected	Steps, hazards, controls — structure is yours to set	Same structure; often shorter and used as a daily briefing sheet	Prescribed structure, submitted and accepted before the activity starts
Also names	Controls and PPE per step	Controls and PPE per step	Required inspections, training, and the competent or qualified person for the activity
Typical use	General industry and private construction task planning	Whichever term your company or hiring client already uses	Federal and Corps work, per definable feature of work
Who accepts it	Your own competent person, on site	Your own competent person, on site	The government representative named in the contract
Governing reference	OSHA's recommended practice for hazard assessment; individual standards name specific assessments (for example, the PPE hazard assessment under 29 CFR 1910.132)	Same as JHA	EM 385-1-1, the USACE Safety and Health Requirements Manual
Scope of each document	One task or job	One task or job	One definable feature of work — a contract can require many AHAs
Review cycle	Reviewed when the task, equipment, or conditions change	Reviewed when the task, equipment, or conditions change	Submitted and accepted before the activity starts; revised and resubmitted when conditions or the work plan change
If you hand over the wrong one	Usually fine — a JHA and JSA are interchangeable in practice	Usually fine — a JHA and JSA are interchangeable in practice	A JHA submitted where the contract specifies an AHA is typically returned for rework in the EM 385 format

Which one do you actually need?

It comes down to who's asking and what work you're doing. General industry or standard construction task planning — JHA (or JSA if that's your client's term). Federal or Corps of Engineers contracts under EM 385 — AHA, in its specific structure. The mistake to avoid is assuming they're always interchangeable and handing a client the wrong format for their requirement.

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Generate the right one for the job

TemplaKit generates JHAs, JSAs, and AHAs — including the EM 385-structured AHA for federal and Corps work that most generic tools don't offer. Each is built to the correct format for its purpose, so you hand your client the document they actually asked for.

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Related guides

Common questions

Can I submit a JHA where an AHA is required?: Usually not as-is. AHA formats under EM 385-1-1 require additional fields — competent and qualified personnel, training, inspection requirements — that a standard JHA form often omits.
Is a JSA legally different from a JHA?: No. The terms are interchangeable; OSHA uses 'job hazard analysis' while many employers and portals say 'JSA'.