Project Delivery Systems for Capital Projects: a Multi-attributed Decision Support System

摘要

This paper describes a method for selection of most suitable project delivery systems for capital projects. It expands upon the method advanced by the Construction Industry Institute (CII) -Owner's Tool for Project Delivery and Contract Strategy Selection, (2003). The extensions included in this paper alleviate the inherent subjectivity associated with the assignment of relative weights to the selection factors, used in the CII method. To set the relative weights in an objective manner, several types of pair wise comparisons and their respective calculation methods were analyzed. Two types of binary methods and the Analytical Hierarchy Process (AHP) method, using the relative importance scale of 1 to 9, were considered. The results were compared to those obtained using the Super Decisions software, which is based on the mathematical theory of AHP. The results obtained through the methods AHP-3 and AHP-4 were found reasonably close to those obtained from the Super Decisions. The calculation of the consistency ratio allows the decision-makers to refine the pair wise comparison process to achieve reasonable consistency. The developed method was implemented in a spreadsheet application and a case study previously analyzed by the CII was considered to enable a comparison. The contribution of this paper is in establishing a simple approximate method for calculating relative weights based on pair wise comparisons, without compromising the results accuracy. The developed method has been integrated with the CII spreadsheet, thus eliminating the data transfer between different programs. It also can be used as a stand-alone decision support system.