Verify the control—not just the equipment. Evaluate whether ventilation, isolation, work practices, and PPE are controlling exposure as intended.
low signal decision-grade
A
Engineering-control review
Frame the operating question and evidence needed.
B
Ventilation observations
Work with the people who plan, supervise, and perform the task.
C
Work-practice evaluation
Build controls and routines that fit the actual operating context.
D
Effectiveness follow-up
Verify adoption and effectiveness, then adjust.