2019 CSCE Annual Conference - Laval (Greater Montreal) Conference
Dr. Tarek Hegazy, University of Waterloo (Presenter)
Schedule Flexibility and Compression Horizon: New Key Parameters for Effective Corrective Actions
Tarek Hegazy1, Zinab Abuwarda1,2,3
1 University of Waterloo, Canada.
2 Port Said University, Egypt.
Abstract: To meet strict project deadlines, practitioners are frequently faced with situations that require effective corrective actions such as speeding up some construction tasks. As corrective actions are necessary to accommodate the inevitable delays, the ability to do further actions becomes dependent on the capacity of the schedule to accommodate further actions of the schedule. This paper, thus, introduces a new concept “Schedule Flexibility” that refers to the residual capacity of an initial or interim schedule as a function of: (1) the activities’ unused modes of construction; (2) the activities’ unused crashing options; and (3) the activities’ remaining total floats. For practicality, schedule flexibility takes into account the preference in having the corrective action implemented on a short-term or a long-term compression horizon of the project. As such, both the schedule flexibility and the compression horizon become two important parameters that govern corrective action plans. These two parameters are often overlooked in the typical focus on time and cost in schedule compression. A case study project with alternative corrective actions was used to examine the relationship between compression horizon and the schedule flexibility. The case study showed that time, cost, and schedule flexibility can identify the optimum compression plan and its horizon, to correct schedule defaults without exhausting the project’s residual flexibility.