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1 per-use cost
"A set fee for the use of a resource that can be in place of, or in addition to, a variable. For work resources, a per-use cost accrues each time that the resource is used. For material resources, a per-use cost is accrued only once." -
2 pessimistic duration
"The worst-case possibility for the total span of active working time expected for a task, that is, the amount of time from the pessimistic start to pessimistic finish of a task."