"With the accumulation of experience and development of robust project methods, one would expect a decrease in overruns over time. While this was found to be true in the case of time overruns, there was no evidence that cost overruns have significantly changed over time. This indicates two things. First, there seems to be an inherent bias in the procurement methods which makes such cost overruns beneficial to contractors and other parties involved. Second, project management tools and techniques need further development."