Final answer:
The best control plans for the given control problems are Locked/Secured Storerooms, Perpetual inventory records, and Warehouse bin location analysis.
Step-by-step explanation:
To solve the control problem where inventory is stolen by warehouse personnel who claim it was shipped to the retail store, the best control plan is to implement Locked/Secured Storerooms. This ensures that only authorized personnel can access the inventory and reduces the risk of theft.
For the control problem of manufacturing managers having trouble planning production due to a lack of knowledge of the quantities on hand, the best control plan is to use Perpetual inventory records. This involves keeping real-time records of inventory quantities, allowing managers to accurately plan production.
In the control problem of inventory being stolen at night from the storeroom with windows left open, implementing a Warehouse bin location analysis would be the best control plan. This involves analyzing the placement of goods in the warehouse to ensure popular items are conveniently located and reduce the opportunity for theft.