The process of purchasing materials and supplies comprises procedures and activities to acquire goods in the correct quantity and in a timely manner. The process should include how purchases are started (e.g., inventory levels), who is involved and how it is made. In addition, the process covers the communication of purchases to all required areas of the company (e.g., accounting). Inventory management follows and starts from the time inventory purchases are received to the time the inventory is sold to the customer and payment is received.