What it means
DART looks at the more serious part of your recordable cases. It counts the ones where a worker missed days, worked restricted duty or was moved to another job because of the injury or illness.
The formula: DART = (number of cases with days away, restricted work or job transfer x 200,000) / total hours worked by all employees in the same period.
It uses the same 200,000 hour base as TRIR. Cases that only needed medical treatment, with no missed days and no restriction, are in TRIR but not in DART. Check the current OSHA recordkeeping rules for how to classify a case.
Why it matters
Two sites can have the same TRIR and very different injuries. DART shows how many of those cases pulled someone off their normal work. Customers and insurers often ask for it next to TRIR.
What it looks like on a site
- The lead sorts each recordable case on the 300 log by days away, restricted work or transfer.
- A worker back on light duty after a hand injury is a restricted case, even though they came to work.
- The lead keeps the hours figure the same one used for TRIR, so the two rates line up.
- Prequalification forms ask for DART in its own line. Fill it in from the log, not from memory.
This is general information, not legal advice. Check the current rule and your own procedures. Back to the glossary