A Job Safety Analysis (JSA) is used to identify hazards and control risks associated with safety-critical tasks. It involves breaking the task down into steps, identifying hazards at each step, assessing risks, and defining controls to reduce risks. Developing a JSA requires identifying those involved in the task, breaking it into steps, identifying hazards and initially assessing risks at each step, defining controls, assessing residual risks, and documenting the analysis. Regular review and update of JSAs is important when conditions change.