Abstract Variation orders are the most disruptive and unpleasant events of the projects because of their impacts on cost and completion date of the project. This study is about the variation orders in highway projects that are the most severe problems in the highway projects. Variation order is any modification to the contractual terms of a project by the owner or the owner's representative, it can be a work that is added to or deleted from the original scope of work of a contract, which alters