S
Steve House [Project MVP]
I think I know why they subtract from the finish instead of adding to the
start ... try both methods when there is lag time between one or more
performance tasks under the summary in question. When evaluating progrsss
with an eye to managing the project, it is more important to accurately
answer the question "How much do we have left to do?" than it is to worry
about "How far have we come?" If you add [Start] + ([%Complete]*[Duration])
and the subtasks have lag times, you get an artificially low estimate of
progress, artificially high estimate of remaining duration. But [Finish] -
((100-[%Complete])*[Duration]) gives an accurate estimate of time remaining,
which is the object of the exercise in the first place.
start ... try both methods when there is lag time between one or more
performance tasks under the summary in question. When evaluating progrsss
with an eye to managing the project, it is more important to accurately
answer the question "How much do we have left to do?" than it is to worry
about "How far have we come?" If you add [Start] + ([%Complete]*[Duration])
and the subtasks have lag times, you get an artificially low estimate of
progress, artificially high estimate of remaining duration. But [Finish] -
((100-[%Complete])*[Duration]) gives an accurate estimate of time remaining,
which is the object of the exercise in the first place.