Delays are among the most common phenomena in the construction industry. During the last three decades delays have occurred in most types of projects, from simple Building projects to the most complex projects such as nuclear power plants or tunneling Works. Generally, delays may be caused by: the client (compensable delays); the contractors (non-excusable delays); or acts of God or a third party (excusable delays). This paper classifies the main causes of non-excusable delays according to the source of occurrence, then identifies the factors contributing to those causes.
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