A Job Safety Analysis (JSA) breaks a specific task into its individual sequential steps, identifying the hazards present at each step and the controls needed to manage them — a structured, step-by-step approach rather than a single overall risk rating for the whole task.
JSA vs a General Risk Assessment
- General risk assessment — identifies hazards and controls for a task as a whole
- JSA — breaks the same task into individual steps (e.g., Step 1: rig the equipment; Step 2: isolate power; Step 3: begin work) and identifies hazards specific to each step, since the risk profile often changes significantly as a task progresses
This granularity matters because the hazard at “isolating power” is genuinely different from the hazard at “beginning the physical work” — a single blanket risk rating for the whole task can miss step-specific dangers that a JSA catches.
A Typical JSA Format
| Step | Hazard | Control Measure |
|---|---|---|
| 1. Rig scaffolding | Fall from height, dropped tools | Harness, tool tethers, area barricaded below |
| 2. Isolate equipment | Unexpected energization | Lockout-tagout, verify isolation |
| 3. Begin hot work | Fire, fumes | Fire watch posted, ventilation confirmed |
When JSAs Are Typically Used
- Non-routine tasks without a standard, pre-established procedure
- Higher-risk work like enclosed space entry, hot work, or working aloft
- New or unfamiliar tasks where the standard risk assessment format doesn’t capture enough step-specific detail
Why the Step-by-Step Format Matters Practically
JSAs are particularly effective at catching hazards that only exist briefly during a specific phase of a task — a risk that’s genuinely present for the two minutes of isolating equipment but not before or after — which a broader task-level risk assessment can more easily miss.
Exam Relevance
JSA methodology and its distinction from general risk assessment are core Safety Management topics in deck and engineering officer competency exams.