Decadal Survey

Decadal Survey. A Decadal Survey is a strategic planning exercise conducted approximately every ten years by the United States National Academies of Sciences, Engineering, and Medicine. These comprehensive studies are commissioned by major federal agencies, primarily NASA and the National Science Foundation (NSF), to establish consensus priorities and provide recommendations for the most compelling scientific questions, missions, and infrastructure investments in a given field for the coming decade. The process involves hundreds of experts from the academic and research communities and produces influential reports that guide national policy and funding allocations for major scientific endeavors.

Overview

These strategic assessments are foundational documents for American research enterprises in fields like astronomy, planetary science, heliophysics, and Earth science. Key sponsoring entities include NASA's Science Mission Directorate and the NSF's Directorate for Mathematical and Physical Sciences. The resulting reports, such as *New Worlds, New Horizons* for astronomy or *Origins, Worlds, and Life* for planetary science, present a ranked list of recommended missions, from large flagship endeavors to smaller probes and ground-based observatories. The process is designed to be community-driven, aiming to balance ambitious scientific discovery with technical feasibility and realistic budgetary expectations, thereby providing a coherent roadmap for federal agencies and the United States Congress.

History and development

The concept originated in the 1960s with the Space Science Board, a predecessor to the current Space Studies Board at the National Academies. The first true decadal survey for astronomy and astrophysics was published in 1964, championed by figures like Lyman Spitzer and setting the stage for future great observatories. A pivotal moment came with the 2001 astronomy survey, *Astronomy and Astrophysics in the New Millennium*, which strongly advocated for the James Webb Space Telescope as its top priority. The model proved so influential that it was formally adopted by other disciplines; the first dedicated decadal for planetary science was released in 2003, followed by surveys for solar and space physics and for Earth science and applications from space, solidifying a recurring cycle of strategic planning across NASA's science divisions.

Process and methodology

The methodology is rigorous and highly structured, typically taking two to three years to complete. The National Academies appoint a steering committee and several thematic panels, comprising scientists from universities, national laboratories like Los Alamos or JPL, and other research institutions. These panels solicit extensive white papers from the broader community, hold town hall meetings at conferences such as the American Astronomical Society meeting, and conduct detailed studies of proposed mission concepts. Committees often work with agency engineers to assess technical readiness and cost estimates, employing a "science-first" approach where scientific merit is the primary criterion for ranking projects before considering implementation risks, leading to a final consensus report delivered to NASA Headquarters and the NSF.

Notable surveys and impact

Several surveys have directly shaped the trajectory of American space science. The 2001 astronomy survey's endorsement led to the development and eventual launch of the James Webb Space Telescope. The 2011 planetary science survey, *Vision and Voyages*, prioritized the Mars 2020 rover (Perseverance) and the Europa Clipper mission. The 2017 Earth science survey, *Thriving on Our Changing Planet*, influenced the design of the NASA-ISRO Synthetic Aperture Radar (NISAR) mission. Furthermore, these documents have been instrumental in securing congressional support and sustained funding for long-term projects, establishing the foundational science goals for major facilities like the Vera C. Rubin Observatory and influencing international partnerships with agencies like the European Space Agency.

Criticism and challenges

Despite their authority, the surveys face significant criticism and operational challenges. A primary concern is cost overruns and schedule delays for top-ranked flagship missions, such as those experienced by the James Webb Space Telescope, which can consume disproportionate shares of an agency's budget and displace other recommended projects. The process has also been critiqued for potential conservatism, potentially favoring established institutions like the Applied Physics Laboratory over newer entrants. Furthermore, the ten-year cycle can struggle to adapt to rapid technological changes or new scientific discoveries, and the assumption of a growing budget envelope is often upended by federal fiscal realities, leading to difficult deferrals or cancellations, as seen with parts of the ExoMars program partnership.

Category:Scientific research