A Guide to Creating a Job Safety Analysis (JSA)
How to identify hazards and define effective controls for safe work on construction sites and in industry.
The three basic steps of every JSA
A good Job Safety Analysis takes a team approach: an HSE professional working with the people who actually do the job. The process has three key phases:
- 1. Break the job down into steps: Don't split the job into too many tiny details (individual movements), but don't make the steps too broad either. Aim for 10 to 15 steps per task.
- 2. Identify the hazards: For each step, ask yourself: "What could go wrong here?" Could a worker fall, get caught, be exposed to a chemical or get an electric shock?
- 3. Define preventive measures: Set a specific control for every hazard you identify. Avoid vague phrases like "be careful". Use concrete instructions such as "use a safety harness attached to anchor point X" or "isolate the power supply and apply a lock (LOTO)".
Why is a JSA essential?
Unlike a bulky risk assessment document that sits in an office, a JSA is a living, practical document. It serves as:
- A training tool: Ideal for quickly training new workers on a specific task (as a Toolbox Talk).
- A basis for work instructions: An excellent foundation for writing permanent safe work procedures.
- A prerequisite for a permit to work: Before contractors start hazardous work (welding, working at height), a JSA makes sure everyone is aware of the specific local hazards.
Involving workers is the key to success
The biggest mistake when creating a JSA is having the safety professional write it alone in the office. The workers who perform the task know its hidden hazards best, as well as the shortcuts they usually take. Talk to them, watch them work and agree together on controls that are practical to follow.
Frequently asked questions about JSAs
What is a JSA (Job Safety Analysis)?
A Job Safety Analysis (JSA) is a procedure in which a specific work task is broken down into its basic steps. For each step, potential hazards are identified and safety measures are defined to prevent accidents. It is sometimes also called a JHA (Job Hazard Analysis) or SWA (Safe Work Analysis).
What is the difference between a JSA and a general risk assessment?
A general risk assessment covers an entire workplace or facility. A JSA is much more specific: it focuses on one concrete, often high-risk task (e.g. repairing a specific machine, entering a confined space or erecting scaffolding) and details exactly how to do it safely, step by step.
When should a JSA be created?
A JSA is recommended for: 1) jobs with high injury rates, 2) jobs with the potential for severe injuries (even if they are performed rarely), 3) new work processes and equipment, 4) complex tasks that require written instructions, and 5) before starting non-routine and hazardous work (often as a prerequisite for issuing a permit to work).