To be completely certain of substantive end results before you are out of the initiation phase of a project.
To realistically envision the potential problems/issues before you are out of the initiation phase of a project thus being able to mitigate/eliminate the consequences of the risks.
Create breakthrough innovations that systematically overcome the "psychological inertia" that are used in many heuristical techniques (E.g. brainstorming, lateral thinking etc. )
To produce a large range of solution concepts.