There are two known compression techniques to a given project schedule to shorten. These are generally applicable to any project plan to bring additional costs and risks.
When Fast Tracking be parallel activities (That is running simultaneously), which followed one another in the original plan. The obvious time savings are achieved at the risk of dependencies are identified between the parallelized activities until late. This may have caused delays and / or partial results have to be reworked.
When Crashing activities are required under the estimated duration shortened. This is usually done through the wider use of resources thereby incurring additional costs. These costs are often disproportionate when the activities of more resources can not run faster in equal measure. At the same time there is a risk that the project manager has overestimated the acceleration potential.
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