As purchaser, I do scheduling of items to when to generate its item master list as to know what items are in need for re-order and monitors time to time the fast moving one such as cement. And also monitors to slow moving items that needs to be phased-out. In other hand, also the one who make an item code for new item for entry in the system. Also the one who communicate with supplier in terms of items with defects and what to do regarding it. I do also entry of supplier's invoice before forwarding it to accounting since I am the one who orders the item and knows its price and negotiation of it.