The recovery schedules are often required by owners, as a requirement for contract in order to achieve the completion date.

This is in principal, a revised schedule, which have adjusted links and durations so that the target date will be achieved.

The main things to do are:

1) Fast Tracking: The activities may often need to be stacked on each other. You can do this by for example changing the FS , finish to start links into SS+x days relations, so that means you do not have to wait for one activity to finish in order to start the next one but you must make sure this is doable in the field and this will now require more careful coordination in the field.

2) Crashing: Sometimes the durations may need to be adjusted. You may do this by adding more resources to an activity, or make the existing resources work more time, such as overtime. Be careful that adding resources or working overtime may have physical limits, sometimes there is a limit of how fast a task can go. For example, you can not make the painting work go faster than erecting interior walls. Or you can not assign 10 electricians to finish a conduit work, where more then 5 would not contribute anything to the speed. There are physical limits which you must observe and be aware

3) Rearranging links: This is not a preferred practice which also means the links you assigned to activities were not good in the first place. Changing links in the middle of the project is not preferred. However during the course of the job, as reality dictates this is done often.

As a result of all these described above, your critical path will change. In fact, as you do this while making your revision, your critical path will change constantly. You must adjust according to your requirements.