Causes and penalties of variation - A case study of a concrete slab prefabrication shop

Chao Wang, Simon Hsiang, Min Liu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Concrete precast plants require strict control over and adherence to the timing and sequence of operations. Variation for this research is divided into the variation in task starting time (the difference between the planned and the actual starting time) and the variation in task duration (the difference between the planned and the actual task duration). This study determined causes of variation in task starting time and duration of precast concrete slab production tasks and used STROBOSCOPE simulation techniques to demonstrate the penalties associated with not reducing variation, which are 1) overtime, 2) Work in Progress (WIP) increase, 3) cost overrun, and 4) labor productivity decrease. It was found that simply taking managerial actions, such as keeping workers waiting or busy, is insufficient for managing variation and effort should be put to reduce variations and make plan more reliable. The results could help prefabricators to understand the causes and penalties of variation, which is the starting point of attacking and reducing variations.

Original languageEnglish (US)
Title of host publication19th Annual Conference of the International Group for Lean Construction 2011, IGLC 2011
Pages220-229
Number of pages10
StatePublished - 2011
Externally publishedYes
Event19th Annual Conference of the International Group for Lean Construction 2011, IGLC 2011 - Lima, Peru
Duration: Jul 13 2011Jul 15 2011

Publication series

Name19th Annual Conference of the International Group for Lean Construction 2011, IGLC 2011

Conference

Conference19th Annual Conference of the International Group for Lean Construction 2011, IGLC 2011
Country/TerritoryPeru
CityLima
Period7/13/117/15/11

Keywords

  • Causes
  • Concrete slab prefabrication
  • Lean construction
  • Penalties
  • Variation

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction

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