Yes. NITAAC's value-added services are available to customers anytime, including during market research. If you will be using a NITAAC vehicle for your procurement, an SOW/PWS/SOO review is available prior to submitting your requirement into e-GOS.
Yes. Modifications can be issued as long as they are within scope of the initial order. In general, if the modification does not change the nature of the work and was within the contemplation of the parties when the order was formed, the modification falls within scope of the initial order.