A good starting point of course is when there is an accepted program on project because if this does not exist, this adds another unknown element of risk to any analysis. In general any schedule should record the true historic position of a project and realistically forecast the outstanding works in a reliable and logical way, but that is not always the case. The baseline schedule is about forecasting, and things may not materialise as one party intends, so people can always argue about it, but people can’t really argue with the as-built schedule. The best accuracy that the forensic schedule analyst can really hope for is an objective reflection of the facts as represented by the documents. In programmes such as Primavera such a chart would still show the foundations activity with a finish date on the 25th of November, even though the operator set it up as a must finish by the 21st of November.