A purchase order (PO) is a legally binding document created by a buyer and presented to a seller, or vice versa. It lays out the order details, including quantity and types of products the buyer needs, as well as payment terms and delivery details. But that is for goods (pencils, chairs, flowerpots, etc.). POs are inappropriate for engaging an architect or engineer (A/E) for professional design services, and here is why.  Continue reading the April Building Blocks.