Although baseline plans can significantly increase your project file size, it is nice to have the option of saving smaller bits of project data through the use of interim plans. The key difference between these two plans is that baseline plans store costs, dates, durations, and work. This is very handy when you want to save the result of the planning phase of your project. Baselines also work well for saving your project data at each major planning milestone. Baselines are best saved after your project has actual data. However, to save only task start and finish dates after the project begins, you can use interim plans. Interim plans work well when saved throughout the project, such as on a monthly or quarterly basis. At its core, an interim plan is a scaled-down version of a baseline.