Project changes and its research present state abroad

Project changes are inevitable for construction project,and its causes are various. Project changes are amendment and supplement of the contracts due to changes of contract condition during its implementation,and corresponding adjusting measures to contract prices and the schedule.The clear understanding of the concept of project changes helps project controllers to difine project change activities and handles them according to controll procedures of project changes,thus reducing its impact on project objectives and avoiding the evolving of project changes into claims.Project changing is one of the causes resulting in project inverstment overrun and schedule delay.The reason that many projects can't realize their objectives is that the owner constantly raises changes during construction.In order to reduce the impace on project objectives due to changes,our counterparts abroad have been made in-depth research on control over project changes and have presented some faviorable control measurements.