Manufacturing Lead Time (TML)
Example Problem
Answer
Critical Ratio (CR)
Example Problem & Answer
Forward Scheduling
assumes that material procurement and operation scheduling for a component start when the order is receive, whatever the due date and the operation are scheduled forward from this date. The result is completion before the due date which usually results in a build up of inventory. This method is use to decide the earliest delivery date for a product. Forward scheduling is used to calculate how long it will take to complete a task. The technique is used for purposes such as developing promise date for customers of figuring out whether an order behind schedule can be caught up.
Backward Scheduling
The last operation on the routing is scheduled first and is schedule for completion at the due date. Previous operation are scheduled back from the last operation. This schedules items to be available as needed and is the same logic as use in the MRP system. Work-in-process inventory is reduced but there is little slack time in the system, customer service may suffer backward scheduling is used to determine when an order must be started. Backward scheduling is common in industry because it reduces inventory.
