T ARTICLE PEER REVIEWED Evaluating the …

Changes on a construction projectare commonplace, despite thefact that contractors often signfixed price contracts. This may be due inpart to the fact that the owners often have aunilateral right in the contract to imposesuch change. Reasons for changes mayinclude new requirements, design errorsand omissions, inadequate contractdocuments, and differing site conditions, toname a every change to a constructionproject has some effect on the project s costand schedule. There are generally twocategories of this effect: The actual direct cost and time ofperforming the change (additionallabor, materials, equipment). And, The impact the change may have onother unchanged or contractual workbecause of delay, disruption, change ofsequence, lack of resources, generally do not havemuch difficulty estimating the direct costsor time required to perform a single change,but it is very difficult to accurately estimatethe impact of that change on theunchanged or contractual part of the execute a change it may be necessary todisrupt or delay the unchanged work, orperform it in a manner or sequencedifferent to that originall

C hanges on a construction project are commonplace, despite the fact that contractors often sign fixed price contracts. This may be due …

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