Every organisation should have a clear vision on what it wants to accomplish. Many organisations (companies, open source projects) make a written statement of that vision, to be used as the ultimate test when discussions arise.
The benefit of such a document is clear : every decision can be tested against it, to verify compliance with the end goal. After some internal discussion and fine-tuning, the ImpressCMS is proud to present its Compass to the world. This should give you an idea of what the project stands for, in case it wasn’t clear enough until now.