Schedule compression is a form of mathematical analysis that's used to shorten the project schedule without changing the project scope. Compression is simply shortening the project schedule to accomplish all the activities sooner than estimated.
Schedule compression might happen when the project end date has been predetermined or if, after performing the CPM or PERT techniques, you discover that the project is going to take longer than the original promised date. In the CPM example, you calculated the end date to be July 10. What if the project was undertaken and a July 2 date was promised? That's when you'll need to employ one or both of the duration compression techniques: crashing and fast tracking.
Crashing is a compression technique that looks at cost and schedule trade-offs. One of the things you might do to crash the schedule is add resources—from either inside or outside the organization—to the critical path tasks. It wouldn't help you to add resources to noncritical path tasks; these tasks don't impact the schedule end date anyway because they have float time. Crashing could be accomplished by requiring mandatory overtime for critical path tasks or requiring overnight deliveries of materials rather than relying on standard shipping times. You may find that crashing the schedule can lead to increased risk and or increased costs.
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What you need to know about… Project Management Made Easy! Project management consists of more than just a large building project and can encompass small projects as well. No matter what the size of your project, you need to have some sort of project management. How you manage your project has everything to do with its outcome.