Purchase Order
A formal document a buyer issues to a supplier authorizing the purchase of specific materials or equipment at an agreed price and delivery date, the mechanism most material purchases actually run through, distinct from the subcontract agreements used for labor and installation.
Why it matters
A verbal agreement to buy materials leaves both the buyer and supplier exposed if a price, quantity, or delivery date gets disputed later. A purchase order creates a clear written record of exactly what was ordered, at what price, and when it's due, the paper trail a [[concept-long-lead-item|long-lead item]] purchase especially depends on.
On a real project
A project team issues a purchase order to a switchgear manufacturer specifying the exact equipment, price, and required delivery date, well before the electrical subcontract for installing that equipment is even finalized.
Who this matters most to
A Procurement Manager issues and tracks purchase orders as a core part of the job, making sure critical materials are ordered on time and at the agreed price. A Project Manager relies on purchase order delivery dates when building the schedule around long-lead equipment.
Where this goes wrong
A project team verbally confirms a material order with a supplier without ever issuing a formal purchase order. The supplier later claims a different price was agreed to, and with no written purchase order to point to, the project team has no strong way to dispute the higher number.