Planner/Projects basically makes your life easier.
At the beginning of the plan there is an annual layout that arranges the year for projects.
Then there is a page where you write all the information about the same project - who is participating in it, the final product that needs to happen, general ideas, etc.
There is then room to break down the tasks into allotted times.
Then there are a few pages of plain lines for all sorts of nonsense and other things that come up during the work period.
The planner is suitable for several projects, and not every notebook for the project.