What are some of the causes of these delays that lead to claims by owners against the contractors?

Construction projects are notoriously delayed causing a myriad of problems. What are some of the causes of these delays that lead to claims by owners against the contractors? What are some of the subsequent, or even indirect results of these delays? Can you suggest solutions including, but not limited to contractual changes, changes in the law, or changes in trade practices that could mitigate some of these issues?

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