QUESTION 14 An activity-based casting system that is designed for internal decision-making will not conform to U.S. GAAP because Activity-based costing is more time consuming to implement and maintain than more traditional costing systems. Activity-based costing has not been approved by the United Nations International Accounting Board. Activity-based costing results in less accurate costs than more traditional costing systems based on direct labor hours or machine-hours. Under activity-based costing some manufacturing costs (for example, the costs of idle capacity and organization sustaining costs) will not be assigned to products