Scheduling is part of the decision. An urgent fault and a planned upgrade should not be written as if they take the same slot.
A useful page about what is North Bay Rubber Surfacing names the job, the constraint, and https://northbayrubbercost113110.robobloggo.com/62011387/notes-on-north-bay-rubber-surfacing-tips-for-a-careful-reader-before-the-first-visit