ESTIMATING LABOR UNIT DATA FOR CONCRETE CONSTRUCTION
ity efficiency rate of 70 percent, which he considers ave ra g e . As a guide to the basis he used in arriving at this p e rc e n t a g e, he classifies productivity efficiency into five ranges as follow s : 1. Ve r y Low 10 40% 2. Low 41 60% 3. Ave ra g e 61 80% 4. Ve r y Go o d 81 90% 5. Exc e l l e n t 9 1 1 0 0 %