Management systems are not, or at least should not, be foreign to you. We use systems in much of what we do and often don't even give thought to the "system" aspect of the process. Let's say that you want to purchase a new piece of safety equipment. You probably start by placing the item in your budget request. If the budget is approved, you then need to get bids. You select from among the bids and put in a request for a purchase order. Purchasing issues the purchase order and you order the equipment.
The process involved to complete this purchase gives you a good idea of one type of management system. Your purchasing function is not redesigned from scratch for each purchase. The process has been developed and fine tuned over the years to ensure that the essential steps are completed effectively.