Days Away, Restricted, TransferredDART

DART = ((column H + column I cases) × 200,000) / hours worked. It captures the OSHA form 300 columns H (days away from work) and I (job transfer or restriction), so it counts every case that changed what the worker did — sent them home, moved them to light duty, or transferred them to another job. DART is more severity-weighted than TRIR and less noisy than LTIR, which is why it is the rate many safety programs track as their primary severity measure.

DART and TRIR move together in a well-run program, but they can diverge. A rise in DART while TRIR holds steady means the cases that are happening are more severe — more people losing days or being restricted — even if the count of recordable cases is flat. That divergence is the signal that separates a frequency problem from a severity problem, and it changes the intervention: frequency points at hazard exposure and pre-task control, severity points at high-energy events and the serious-injury-and-fatality prevention agenda. See TRIR and LTIR; for the upstream measures, see leading indicator.