AN ANALYSIS OF CHANGE ORDERS IN PUBLIC SCHOOL PROJECTS

摘要

In the construction phase of Design-Bid-Build projects, change orders are among the important aspects that can affect the success of the projects. Change orders in any project adversely affect the project cost and schedule performance. Therefore, change orders should be controlled in order for greater success of the project. It is very important to determine change order costs in new and modernization projects as well as the association between the change orders cost and construction cost growth and schedule growth. This study statistically compared change orders for 171 modernization projects and 98 new projects in public schools built by the Clark County School District (CCSD) of Nevada and constructed from 2001 to 2009. The study collected the total cost of change orders, bid cost, final construction cost, bid duration, and final completion duration of modernization and new school projects. The analysis of variance (ANOVA) and Pearson Correlation tests were used to determine the statistical difference in change order costs and also the association between change order costs and both the construction cost and schedule growth of these projects. The findings of this study are presented in this paper.