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Track 2000
Problem 3 -Scheduling tool implementation
Some scheduling tools allow the default linear completion method to be over-ridden. For example, in Microsoft Project, you can use an actual effort option which enables you to enter 20% complete on Day 3 [curve A]. However, because of the difficulties of programming these tools, once you enter a 20% complete figure, the task is then shown to be 40% over schedule [as it "should" have been 60% complete].
Alternatively, some tools allow options such as the 0/100% complete method which involves a binary state for tasks - either they are completed or not started. Another option involves all tasks having been commenced being treated as default 50% complete until they are finished. Clearly, these options do not recognise the complex patterns of completion and, in reality, are poor compromises.
As a result, most scheduling tools cannot allow for real world tracking.