IDS Terms and Conditions Guide Section H Clause Number: H908S Effective: 9/22/2005 Page: 1 of 1 ARO AS DEFINED BY CONTRACT GO-AHEAD Contract go-ahead is defined as the date of Seller's receipt of written notice from Buyer to proceed with the effort required in connection with the applicable procurement specification. Scheduled events in the Supplier Data Requirements List (SDRL), purchase order or other contractual documents expressed in days, weeks or months after receipt of order (ARO) shall be understood to be days, weeks or months after go-ahead.