MicrosoftВ® Office Project 2003 Step by Step (Step by Step (Microsoft))

Saving a baseline saves a large set of task, resource, and assignment values in a project plan. Saving an interim plan, however, saves only the start and finish dates of tasks.

If you track work at the task level, work rolls down to the assignments. Conversely, if you track work at the assignment level, work rolls up to the task level.

In usage views, you can change the time increments on the lower tier of the timescale to match the time period against which you wish to track. For example, if you wish to record actual work as full weeks, you can set the timescale to display weeks on the lower tier.

Should work on a project be interrupted for some reason, you can reschedule the work to begin again on the date you specify.