Use of Percent of Constraint Removal to Measure the Make Ready Process

Jin Woo Jang1 & Yong-Woo Kim2

1Ph.D. Candidate, Constr. Engr. and Mgmt. Program, Constr. Mgmt. and Wood Product Engrg. Department, 156 Baker Lab, State University of New York, College of Environmental Science and Forestry, Syracuse, NY 13210, 315/470-6831, FAX 315/470/6879, jijang@syr.edu
2Assistant Professor, Constr. Engr. and Mgmt. Program, Constr. Mgmt. and Wood Product Engrg. Department, 153 Baker Lab, State University of New York, College of Environmental Science and Forestry, Syracuse, NY 13210, 315/470-6839, FAX 315/470-6879, ywkim@esf.edu

Abstract

Project process controls have traditionally occurred after-the-fact, and have focused exclusively on finding discrepancies and measuring results after a specific period of time. The Last Planner® System (LPS) is a production planning and control tool focused on the make-ready and shielding processes for improving workflow reliability. In the LPS, percent plan complete (PPC) has been used as a measurement of the shielding process. However, the system lacks a measurement for the makeready process. This paper proposes a new measurement for the make-ready process called percentage of constraint removal (PCR). This new measurement of constraint removal would be an efficient and flexible means to measure the make-ready process. This measurement provides 1) a leading indicator for work production performance, 2) a performance measurement for the make-ready process, and 3) how appropriately to size the look-ahead window. This paper presents three case studies of heavy construction projects where both performance measurements, PCR and PPC, were applied and investigated. How PCR and PPC are correlated with progress performance was also studied.

Keywords

Last Planner® System, make-ready process, percent plan complete, percentage of constraint removal, case study.

Files

Reference

Jang, J.W. & Kim, Y. 2007, 'Use of Percent of Constraint Removal to Measure the Make Ready Process' In:, Pasquire, C.L, C.L. & Tzortzopoulos, P., 15th Annual Conference of the International Group for Lean Construction. East Lansing, Michigan, USA, 18-20 Jul 2007. pp 529-538

Download: BibTeX | RIS Format