the area that best describes the requirements that must be met prior to achieving the goal
Achieving a goal is not a one-step activity. Rather, all the cogs and wheels of a situation must be adjusted and realigned first in order to enable the goal. That can entail taking a certain number of steps in sequence and/or involve "tuning" the orchestra of the dramatics until they support the harmony of the goal. Both the sequential and holistic approach to these prerequisites and preconditions are described by the nature of the overall requirement to achieving the goal. In other words, the requirement describes the condition requisite to the goal and is made up of prerequisites and preconditions.