| Title |
A Calculation Method on the Loss of Labor Productivity due to Change Orders |
| Keywords |
Change orders ; lost productivity ; labor productivity ; additional costs ; claim |
| Abstract |
Change orders are common occurrence on construction projects. When the amount of changed work increases to a level that is greater than could have reasonably been expected, the contractor may experience a lost productivity on the unchanged work as well as the changed work.
Sometimes change orders can affect the labor productivity and consequently increase additional costs. The reasons cited for these additional costs vary but generally it comes down to one general category, lost labor productivity. But calculating lost labor productivity on a construction project resulting from specific causes can be difficult. In foreign country cases, many claims related to lost labor productivity quote research statistics data; the claimant employ the tables published by Mechanical Contractors Association, National Electrical Contractors Association, R.S. Means Building Construction Cost Data, or Business Roundtable Study as substantiation for the methods used to calculate lost labor productivity.
In domestic cases, the study of the reason why these factors affecting lost productivity arise and how these factors affect entire project has not been performed. Therefore, the objective of this paper is to analyze factors affecting lost productivity and to propose a methodology to calculate the lost productivity in construction projects. |