I write everything down exploring all possible scenarios and outcomes. The great thing about writing is that it helps clarify thoughts which leads to actionable strategies. You take every possible outcome into consideration and as things unfold adjust your course likewise. It has helped me keep track of things and organize better.

Oh and by saying write down I mean write with pen and paper. It's much more fruitful than opening a word processor and start punching words through a keyboard or a touchscreen.