the.com/prerequisite
The gate before the gate, demanding you prove you belong before you can begin.
means Something you must have or complete first before you're allowed to do, take, or get the next thing.
from From Latin prae- (before) plus requisitus (sought after) — literally a thing demanded in advance, the bouncer of the logical world.
Course speakHalf of college scheduling is decoding these chains.
Hidden cousinDiffers from corequisite, which must run alongside, not before.
Quiet tyrannyOne missing prerequisite can stall an entire plan.