The system to start upgrading first is the Inventory Management system followed by the POS system (point-of-sale) because they affect the customers most.
However, upgrading the inventory management system should be closely followed by the upgrade of the POS system. If the inventory management system is not working, the POS will malfunction and involve manual input of customers' data. The malfunctioning of the POS must be avoided.
It appears more appropriate to upgrade the two systems because the POS is more dependent on the inventory management system, and the upgrades must link for seamless customer service performance.
Thus, as well as upgrading the inventory management system, the POS system needs a timely upgrade to align with the upgraded inventory management system and the perpetual inventory system.
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