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What is the difference between fixed work and fixed duration?

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I know that both fixed work and fixed duration are scheduling techniques, but what are the differences between them? And which one is best, and why?
asked 6 years ago by anonymous

3 Answers

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I generally prefer fixed work.  The reason is that once the team has estimated the effort and everyone agrees, we want to honor that estimate.  Arbitrarily changing the effort estimate will lead to late projects and unhappy project team members.  That means if there is a scheduling issue, I can bring in more resources, do more work in parallel, change the scope, or let the project sponsor know we are going to need more time.  But I won't promise that the project team can deliver the project at anything less than their good faith estimate of the work.
answered 6 years ago by sdcapmp (45,840 points)
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Fixed work and fixed duration are two of three task types available in MS Project (the third one is fixed unit), and many other PM tools. These task types are used when you have more than one resource assigned to a task.

Fixed work tasks means that the amount of work performed on the task is fixed. This means that if you add resources, then the duration will decrease, but the work performed will still be the same.

Fixed duration means that the duration of the task is fixed. So, if you add more resources to the project, this means that the workload on every resource is lesser.

When we have one of the 3 parameters fixed (such as unit, work, duration) we will have more control while scheduling the project.

Always remember this formula: Duration = Work / Units, and you will understand how when you fix a variable the other two will vary in reverse proportion to each other.
answered 6 years ago by anonymous
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no such best one, it depends on the project variables you have,

http://forums.techarena.in/microsoft-project/1057969.htm
answered 6 years ago by abeetha (360 points) edited 6 years ago by humblepm

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