Hanna, A S; Chang, C K; Lackney, J A and Sullivan, K T (2007) Impact of overmanning on mechanical and sheet metal labor productivity. Journal of Construction Engineering and Management, 133(1), pp. 22-28. ISSN 0733-9364
Abstract
This paper details the impacts of overmanning on labor productivity for labor-intensive trades, namely mechanical and sheet metal contractors. Overmanning, as used in the following research, is defined as an increase of the peak number of workers of the same trade over the actual average manpower used throughout the project. The paper begins by reviewing literature on the effects of overmanning on labor productivity. Via a survey to various contractors, data were collected from 54 mechanical and sheet metal projects located across the United States. Various statistical analysis techniques are then performed to determine quantitative relationship between overmanning and labor productivity. These techniques include the stepwise method, T-test, P -value tests, analysis of variance, and multiple regression analysis. The results indicate a 0-41% loss of productivity depending on the level of overmanning and the peak project manpower. Cross-validation is performed to validate the final model. Finally, a case study is provided to demonstrate the application of the model.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | construction management; labor; mechanical systems; metals; productivity; scheduling; sheets |
| Index terms: | mechanical system, metal, labour productivity, statistical analysis, productivity, case study, variance, multiple regression analysis, validation, survey, scheduling, United States |
| Subjects: | data science, operations research, mechanical systems, data collection methods, statistical analysis, measurement and scaling, professional development, Geography, traditional and composite building materials, management |
| Topics: | Engineering Principles, Information Management, Construction Materials, Research Practice, Geographical Context, Business Strategy, Time Control, Site Management |
| Descriptive scope: | 4 PCEA |
N.B. Descriptive scope is a count of how many of the five facets of empirical research are indicated by the words used in title, abstract and keywords. It is not intended as a judgement on the research; merely a count of the kind of word we would expect to indicate Phenomenon, Concepts, Theoretical framing, Empirical techniques, Analytical techniques. If all five are present, then a code of “5 PCTEA” will indicate this. If you feel the coding for this record is questionable, we welcome discussion around the terms we matched or the way we categorized them. The facet you would expect may not be coded, or a facet may be coded inappropriately. This can also bear on a larger question, of which facets should be treated as defining in construction management research. Please get in touch, and we will look at it. More details here