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Basha, I M and Gab‐Allah, A A (1991) Value Engineering in Egyptian Bridge Construction. Journal of Construction Engineering and Management, 117(03), 393–401.

Committee on Construction Equipment and Techniques (1991) Trenchless Excavation Construction Methods: Classification and Evaluation. Journal of Construction Engineering and Management, 117(03), 521–36.

Duerr, D (1991) Transportation of Shippingport Reactor Pressure Vessel. Journal of Construction Engineering and Management, 117(03), 551–64.

Fisher, D J and O'Connor, J T (1991) Constructability for Piping Automation: Field Operations. Journal of Construction Engineering and Management, 117(03), 468–85.

Fondahl, J W (1991) The Development of the Construction Engineer: Past Progress and Future Problems. Journal of Construction Engineering and Management, 117(03), 380–92.

Hinze, J and Appelgate, L L (1991) Costs of Construction Injuries. Journal of Construction Engineering and Management, 117(03), 537–50.

Kelley, M N (1991) Ft. Drum Estimating and Bidding from Contractor's Point of View. Journal of Construction Engineering and Management, 117(03), 565–71.

Rasdorf, W J and Abudayyeh, O Y (1991) Cost‐ and Schedule‐Control Integration: Issues and Needs. Journal of Construction Engineering and Management, 117(03), 486–502.

Schubert, F N (1991) U.S. Army Corps of Engineers and Afghanistan's Highways 1960–1967. Journal of Construction Engineering and Management, 117(03), 445–59.

Seibert, J E and Evans, G W (1991) Time‐Constrained Resource Leveling. Journal of Construction Engineering and Management, 117(03), 503–20.

Thomas, H R (1991) Labor Productivity and Work Sampling: The Bottom Line. Journal of Construction Engineering and Management, 117(03), 423–44.

  • Type: Journal Article
  • Keywords: Construction; Productivity; Sampling; Management;
  • ISBN/ISSN: 0733-9364
  • URL: https://doi.org/10.1061/(ASCE)0733-9364(1991)117:3(423)
  • Abstract:
    This paper describes the relationship between labor productivity and direct work as reported in work‐sampling studies. Seven data bases, collected primarily from nuclear‐power‐plant construction projects, are used. Investigations of a 30‐project data base show that direct work is better in the winter than during the rest of the year, is best during the start‐up and testing phase, and has improved since the Three Mile Island accident. It is concluded that these results are illogical. Using linear regression models, the paper shows that direct work is not related to productivity. This conclusion is based on three assumptions: Reducing wait time leads to increased direct‐work time, increased direct‐work time leads to better productivity, and better productivity is accompanied by less time spent waiting. Each assumption is tested, and the model statistics show very poor correlations and predictive capabilities. The most reliable data base, consisting of 46 data points, yielded an ra2 value of 0.00 and a standard error of the estimate that is equal to the standard deviation of the performance measure. The conclusion is that work‐sampling studies show how busy the crafts are, and the results cannot be used to predict labor productivity or to quantify inefficient work hours.

Warszawski, A and Navon, R (1991) Robot for Interior‐Finishing Works. Journal of Construction Engineering and Management, 117(03), 402–22.

Williams, T P (1991) Hypertext Data Base Applications in Construction. Journal of Construction Engineering and Management, 117(03), 460–7.