Once I grokked that myself, it influenced how I ran games from that point onward. I don't have "plots" in my games. I have Polti-style "dramatic situations". And how they progress is determined by how the players interact with them; which roles they took in the situations and how they tried to resolve them.
And I thank ICE's modules for the insight that led me to this style.
(BTW, the back of the adventure modules had entry points, but that was easy to miss if you just flipped.)
