Impact of overmanning on mechanical and sheet metal labor productivity

Awad S. Hanna, Chul Ki Chang, Jeffery A. Lackney, Kenneth Sullivan

Research output: Contribution to journalArticle

20 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)22-28
Number of pages7
JournalJournal of Construction Engineering and Management
Volume133
Issue number1
DOIs
StatePublished - 2007
Externally publishedYes

Fingerprint

Sheet metal
Productivity
Personnel
Contractors
Analysis of variance (ANOVA)
Regression analysis
Statistical methods
Labour productivity
Metals
Manpower

Keywords

  • Construction management
  • Labor
  • Mechanical systems
  • Metals
  • Productivity
  • Scheduling
  • Sheets

ASJC Scopus subject areas

  • Building and Construction
  • Civil and Structural Engineering
  • Industrial and Manufacturing Engineering

Cite this

Impact of overmanning on mechanical and sheet metal labor productivity. / Hanna, Awad S.; Chang, Chul Ki; Lackney, Jeffery A.; Sullivan, Kenneth.

In: Journal of Construction Engineering and Management, Vol. 133, No. 1, 2007, p. 22-28.

Research output: Contribution to journalArticle

Hanna, Awad S. ; Chang, Chul Ki ; Lackney, Jeffery A. ; Sullivan, Kenneth. / Impact of overmanning on mechanical and sheet metal labor productivity. In: Journal of Construction Engineering and Management. 2007 ; Vol. 133, No. 1. pp. 22-28.
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