A Job Hazard Analysis (JHA) is a structured process for examining a job or activity, breaking the work into logical steps, identifying hazards associated with those steps, and determining controls that can reduce risk.
On construction sites, conditions change as work progresses: crews, equipment, materials, weather, and nearby trades all affect the hazards of a task. A JHA gives the crew a shared, written plan for how the work will be done safely before it starts, and a reference point when something changes.
Terminology can vary among employers, owners, projects, and agencies. Similar processes may be called a Job Safety Analysis (JSA), an Activity Hazard Analysis (AHA), or other names depending on the applicable program, and their required format and content may differ.