What criticisms have been directed at activity-based costing?

In an activity-based management system, what are value-added and non-value-added activities? How do value-added and non-value-added activities affect manufacturing cycle efficiency? Why must cost drivers be designated in an activity-based costing system? How are product and service costs computed using an activity-based costing system? Under what conditions is activity-based costing useful in an organization and what information do activity-based costing systems provide to management? What criticisms have been directed at activity-based costing?

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