There are some tasks and milestones "somewhere on the road" to build up the project.
But it does not help me to structure what road I have to follow, what are the critical points of my project : I can't find how to position a milestone as a "key step" to achieve other milestones. Milestones are just following each other, but they should relate to each others differently .
That seems to work only if you do things one by one, which is not the case when it gets a little complex.
Otherwise, I should manage the complexity all by myself.