You have one pool of Business Analysts, Developers and Testers and up to five projects. How do they all fit together? To get all these projects done, how many resources do you really need? What happens to your other projects if one of your projects is late by a week? What happens if you lose someone?
Enter the durations of your projects, and the number of each type of resource. Use the slider buttons to move your projects back and forth through time. When you do that, the graph at the top will change. If any of the lines in the graph go over the capacity line, you have a problem.
You have a limited ability to change the assumptions that go into this worksheet on the second tab (it is quick and dirty after all).