Must-precede

Marks a hard ordering link: item B literally cannot start or finish until item A is done. You are testing necessity, not habit. Ask what physically or logically breaks if you flip the order. If nothing breaks, it is not this kind of link.

Marks a hard ordering link: item B literally cannot start or finish until item A is done. You are testing necessity, not habit. Ask what physically or logically breaks if you flip the order. If nothing breaks, it is not this kind of link.

Example

On the 40-item launch list, penetration testing must precede the security sign-off, and sign-off must precede the production deploy. Flip either and the deploy has nothing to approve. Design before copy fails the test, so you unmark it and free two weeks of slack.