When Should You Use Product Cost by Order?

For individual or lot-related production. It is typically used for order-related production or for batch-related process manufacturing. Production is based on orders for which production and the cost analysis of a certain lot size are the priority.
For test production/start-up production (for planned repetitive manufacturing) for the exact determination of planning data (for example, variance analysis)
When you want to calculate WIP at actual costs
When you want to allocate your lot-size-independent costs
When you want to schedule your orders accurately.