When writing essays, I create only a list of important points to be covered.
For fiction, I create character bio's, timelines, and only a very general plot/event outline. I allow the story details, events and characters to go where they will, even if this sometimes departs from my general outline. As long as the intended message/story is communicated, this process seems to yield a satisfactory result. I think that everyone needs to find out what process works best for them and then just go with it.
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"A man needs a little madness...or else...he never dares cut the rope and be free."
Nikos Kazantzakis, ZORBA THE GREEK
Some of us just have a little more madness than others!