Model for constructability approach selection

This paper presents a model for selecting an approach to implement constructability. Constructability can be implemented using an informal or formal approach. Based upon this research, three approaches, one informal and two formal, have been identified and labeled as follows: (1) Informal approach; (2) formal project level; and (3) comprehensive tracking. The model consists of a hierarchy of decision levels. Within these levels, there exist three steps: (1) Individual assessment of owner and project characteristics resulting in a conclusion of informal or formal; (2) combining owner and project characteristics into a single conclusion of informal or formal; and (3) if formal is concluded, a decision as to whether it is formal project-level or comprehensive tracking. To assess owner and project characteristics, a framework of variables described by parameters has been developed. The characteristics of an owner consist of four variables: (1) Owner type; (2) objectives; (3) in-house expertise; and (4) constructability resources. The characteristics of a project are described by six variables: (1) Construction type; (2) contracting strategy; (3) project size; (4) technical difficulty; (5) location; and (6) peculiarities. The model was tested by six owners on seven different projects. The results were consistent with the constructability approach selected by the owner. The model can assist owners in efficiently determining the appropriate means by which to incorporate construction knowledge and experience into the designs of their projects.