Preconditions are non-essential steps or items that become attached to the effort to achieve the Goal through someone’s insistence. A keen distinction here is that while Pre-requisites are almost always used in relation to the Requirements in a story, Preconditions are likely to apply to either Requirements or the Goal itself. As such, both Goal and Requirements should be taken into account when selecting Preconditions.
Think about the sorts of petty annoyances, frustrations, and sources of friction with which your characters might become saddled with, in exchange for assistance with some essential Prerequisite. If you were one of your characters, what kind of Preconditions would most irritate you?
Appreciations of this level are usually presented as a background item in storytelling. Draw on your own experiences while making this selection so that the level of nuance required can grow from your familiarity.
From the Dramatica Theory Book