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(a) The AO must accommodate to the maximum extent practicable opportunities afforded by the Shuttle/Spacelab flights. The following methods may be used to enable an AO to be open for an extended period of time and/or to cover a series or range of flight possibilities or disciplines:
(1) The AO may be issued establishing a number of proposal submission dates. Normally, no more than three proposal submission dates should be established. The submittal dates may be spread over the number of months most compatible with the possible flight opportunities and the availability of resources necessary to evaluate and fund the proposals.
(2) The AO may be issued establishing a single proposal submission date. However, the AO could provide that NASA amend the AO to provide for subsequent dates for submission of proposals, if additional investigations are desired within the AO objectives.
(3) The AO may provide for an initial submission date with the AO to remain open for submission of additional proposals up to a final cutoff date. This final date should be related to the availability of resources necessary to evaluate the continuous flow of proposals, the time remaining prior to the flight opportunity(s) contemplated by the AO, and payload funding and availability.
(b) Generally, a core payload of investigations would be selected from the initial submission of proposals under the above methods of open-ended AOs. These selections could be final or tentative recognizing the need for further definition. Proposals received by subsequent submission
dates would be considered in the scope of the original AO but would be subject to the opportunities and resources remaining available or the progress being made by prior selected investigations.
(c) Any proposal, whether received on the initial submission or subsequent submission, requires notification to the investigator and the investigator's institution of the proposal disposition. Some of the proposals will be rejected completely and the investigators immediately notified. The remaining unselected proposals may, if agreeable with the proposers, be held for later consideration and funding and the investigator so notified. However, if an investigator's proposal is considered at a later date, the investigator must be given an opportunity to validate the proposal with the investigator's institution and for updating the cost and other data contained in the original submission prior to a final selection. In summary, NASA may retain proposals, receiving Category I, II, or III classifications (see 1872.403-1(e)), for possible later sponsorship until no longer feasible to consider the proposal. When this final stage is reached, the investigator must be promptly notified. Proposing investigators not desiring their proposals be held for later consideration should be given the opportunity to so indicate in their original submissions.