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Extending the Effective Lifetimes of Earth Observing Research Missions (2005) / Chapter Skim
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3 Assessing the NASA Senior Review Approach to Mission Extension
Pages 8-9

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From page 8...
... Funding of extended missions under this approach provides for advanced budget planning that is consistent with the needs of the federal budget process, but it allows NASA to make decisions regarding individual mission extensions as the needs arise. ASSESSMENT OF THE SENIOR REVIEW The committee found that the Senior Review provides an excellent starting point for a missionextension process, although it does not fully address the particular needs of Earth science missions.
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From page 9...
... The Senior Review, currently used as the basis for all NASA decisions on space and Earth science mission extensions, is a thorough and well-run process, but it does not adequately satisfy the unique considerations of Earth science missions.
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