TY - CONF TI - Causes and Penalties of Variation - a Case Study of a Concrete Slab Prefabrication Shop AU - Wang, Chao AU - Hsiang, Simon AU - Liu, Min AD - Graduate Student, Department of Civil, Construction, and Environmental Engineering, North Carolina State University, Raleigh, NC 27695, Phone +1919/946-1954,cwangncsu@hotmail.com AD - Derr Professor, Industrial Engineering, Texas Tech University, Lubbock, TX 79409; Phone +1806/742-3543, simon.hsiang@ttu.edu AD - Assistant Professor, Department of Civil, Construction, and Environmental Engineering, North Carolina State University, Raleigh, NC 27695, Phone +1919/513-7920,min_liu@ncsu.edu ED - Rooke, John ED - Dave, Bhargav PY - 2011 DA - 2011/07/13 T2 - 19th Annual Conference of the International Group for Lean Construction C3 - 19th Annual Conference of the International Group for Lean Construction CY - Lima, Peru AB - 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 KW - Variation KW - causes KW - penalties KW - concrete slab prefabrication KW - lean construction L1 - https://www.iglc.net/papers/details/1114/pdf UR - https://www.iglc.net/papers/details/1114 DB - IGLC.net LA - English N1 - Export date: 04 October 2026 ER -