3. The community will need to give more thought to balancing costs with science objectives and priorities. More explicit decision rules for different budget contingencies might also prove helpful for program managers.

4. Finally, the community will have to look at different ways to construct a healthy and robust mission portfolio—for example, through partnerships and alternative platforms in addition to individual spacecraft and suborbital missions. Preparatory work to identify new technologies and readiness levels could be done ahead of any formal review and indeed could serve as an input to such a review.

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