The unit rate, while you can still fix it.

Quantities come from the capture, not from a form somebody fills in at the end of the shift: linear metres of wall framed, square metres of deck poured, fixtures set, metres of pipe hung — read off the morning flight and the 360 walk by the same head of the Brain that reports progress by trade. Hours come from the geofenced timesheet. Divide one by the other and you have a unit rate in the terms your estimator priced the work in.

Because the comparison runs daily and by crew, a rate that is drifting shows up in week 4 while there is still a head to add, a sequence to change, or a method to fix — instead of at closeout, when it is a lesson. The Brain cites its working: the frames the quantity was read from, the timesheets the hours came from, and the estimate line it was measured against. Rates you accept feed the cost history your next bid is priced from.