Here's how I understand it. Take the movie, Get Out,for example: .
Goal: Conceptualizing, (Figuring out a way to get out of this hell)
Requirements:Conceiving, (What are the missing ideas/elements one needs to know in order to formulate a plan to get out f this hell)
Prerequisite: Learning, (What information must one glean from the storyworld when the inequity is introduced? How does it set up a need for the Requirement(s)?)
Preconditions: Present, (Who/what needs to offer me a boon at this very moment that'll enable me progress toward the Goal. What favour/task can I do to get some sort of help?)
Preconditions for me are some sort of favour thats done on behalf of a storyworld character of choice. It's a nice to have, not an absolute must. I use this to tease the readers. To give them fuller experience of the storyworld. Can be tied to different aspects of the world. Plus I link it indirectly to the Dividend in a small, indirect way. It also serves as some sort of foreshadowing of the said storypoint.