(90)
The clause at 52.213-9011, Indefinite Delivery Purchase Order (IDPO) Agreement, shall be included in solicitation and award documents when a unilateral IDPO is contemplated.  Buyer shall complete the fill-in in paragraph (a).  Do not use for IDPOs conducted using FAR Subpart 13.5 procedures. When using 52.213-9011, include FAR 52.216-18, Ordering; FAR 52.216-19, Order Limitations; and FAR 52.216-22, Indefinite Quantity.  This clause does not apply to IDPOS IAW  FAR 13.5.  
(91)
The clause at 52.213-9012, Indefinite Delivery Purchase Order (IDPO) Contract, shall be included in solicitation and award documents when a bilateral IDPO is contemplated.  Buyer shall complete the fill-in in paragraph (a).   When using 52.213-9012, include FAR 52.216-18, Ordering; FAR 52.216-19, Order Limitations; and FAR 52.216-22, Indefinite Quantity; and except for Part 13.5 acquisitions, include FAR 52.243-1, 52.232-23, 52.249-8, DFARS 252.243-7001, and when applicable FAR 52.204-2.  These clauses are not prescribed for use in commercial acquisitions, therefore, they are not applicable to 13.5 acquisitions. 
An IDPO is a simplified acquisition procedure that applies indefinite delivery contract concepts to simplified acquisitions.  An IDPO, when established by agreement of the contractor, establishes a standing quotation(s) from the contractor for a definite period for an indefinite quantity of supplies.  However, when established as a contract, through performance undertaken by the contractor on a purchase order, an IDPO establishes a firm commitment that the contractor will perform under subsequent orders issued, at the purchase order price for a definite period for an indefinite quantity of supplies.