2/7/2024 0 Comments Atc formula pmpHowever, historical studies show that progress is never linear with time - especially in turnarounds where fatigue is a very real factor. If an early start curve were calculated on a resource leveled schedule, the curve should be almost flat (or linear). The problems with scope fluctuations will not be reflected on the curve (when calculated in a dynamic fashion as outlined above) until late in the turnaround. ![]() Actual progress will almost always appear to be satisfactory early in the turnaround/project, but quickly fall behind at the end (when the curve becomes aggressive). This method produces curves that are back end loaded. Late Start CurveĪ late start curve is calculated by totaling the manhours scheduled from every task’s late start (LS) to late finish (LF) for every reporting period (or shift in the case of a turnaround). It is not possible to know for sure if progress is really insufficient or satisfactory. Actual progress will almost always appear to be insufficient, because it plots below this curve. Where the scope is fairly static, early start curves will tend to be aggressive (or front loaded). This is less than ideal for quick, objective progress analysis. Managers need to maintain a history of these reports to analyze past performance with scope fluctuations in mind. A more dynamic approach is to calculate progress targets based upon the remaining schedule, but this requires using completed work as the starting point (and therefore does not offer any valid means to measure past performance against meaningful targets). ![]() The progress targets will become meaningless as repair work is added to the scope. Fixing progress targets upon a baseline schedule is problematic because the scope for a turnaround will fluctuate. ![]() Which one yields the most satisfactory results for managing turnarounds? Early Start Curve ("Scheduled Start")Īn early start curve is calculated by totaling the manhours scheduled from every task’s early start (ES) to early finish (EF) for every reporting period (or shift in the case of a turnaround). However, there are many different methods for generating progress curves. Progress curves are used extensively throughout the industry as an indicator to detect if the rate of progress is satisfactory to achieve the desired end date. Home ATC Professional™ Summary Progress Curves
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