Another scenario: using concrete as a material resource, the transport for concrete must be inquired only one time, no matter the quantity of the material used (concrete supplier policy). For every different task that the airplane resource will be assigned to, the per-use cost will be inquired (and added to the total cost of the assignment). You would set up a rate-based cost of 200$/hour and a per-use cost of 50$. Imagine a scenario where an airplane is rented for 200$/hour and that before each flight it must pass a quality control check which costs 50$. Note that a resource can have both a rate-based cost and a per-use cost set up. A fixed cost remains constant regardless of the task duration, the amount of work that is performed by the resource, and the number of assignment units. Fixed cost – a cost that is set for a task and not for a resource.Although a per-use cost for a work resource depends on the number of assignment units used, a per-use cost for a material resource is applied only one time. Per-use costs never depend on the amount of work done.
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