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The construction industry is a complex and competitive environment in which participants with different views, talents and levels of knowledge of the construction process work together. In this complex environment, participants from various professions, each has its own goals and each expects to make the most of its own benefits. In the construction industry, since differences in perceptions among the participants of the projects, conflicts are inevitable. If conflicts are not well managed, they quickly turn into disputes. Disputes are one of the main factors which prevent the successfully completion of the construction project. Thus, it is important to be aware of the causes of disputes in order to complete the construction project in the desired time, budget and quality.

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In this paper, the main causes of dispute causes in the construction industry were analyzed. First of all, the main causes of construction disputes were determined with a comprehensive literature review. Then, the disputes derived from the literature, were classified into main categories. According to the classification, main disputes categories were found as; owner related disputes, contractor related disputes, design related disputes, contract related disputes, human behavior related disputes, project related disputes and external factors. All these disputes categories have their own sub-dispute causes. After determining the dispute causes, an approach was carried out to develop some kind of model using the analytical network process (ANP). The model considers the relevant dispute causes which occur in the construction projects. Finally, an analysis was carried out to identify the relative importance of the different dispute causes. The analysis reveals that the contractor related disputes and their sub-dispute categories are the most common ones in the construction industry.

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