טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
Ph.D Thesis
Ph.D StudentIsaac Shabtai
SubjectDevelopment of a Model for Evaluating the Impact of
Proposed Changes in Construction Projects
DepartmentDepartment of Civil and Environmental Engineering
Supervisor Professor Ronie Navon
Full Thesis textFull thesis text - English Version


Abstract

The implementation of changes in construction projects often causes deviations from client objectives such as the cost of the project, the date of completion and the performance requirements. The objective of the present research is to develop a model of construction projects which facilitates a proactive analysis of the impact of changes on primary client objectives in a project, when these changes are initially proposed.

A graph-based approach is used in the present research to model the elements in a construction project and their relationships. Predefined rules for implementing changes in graphs allow the model to be updated automatically. Clustering algorithms identify subsystems in a specific aspect of the project, which are affected by a proposed change, and path-search algorithms identify the indirect impact of the change on the client objectives. A network flow model is used for a quantitative analysis of the magnitude of the impact of a change on the client objectives. The present research examines the use of either scenarios or an info-gap model in order to take into account the uncertainty of the assessments regarding the impact of a change.

The proposed model facilitates an identification of different types of change impact propagation processes. It also facilitates the modeling of management actions, which can be applied to cope with the implications of changes. The model was implemented in case-studies, as well as in simulations in which the assessments and decisions of experts were incorporated. The proposed model can serve as a basis for the development of tools which will enable better management and control of the implementation of changes in projects.