  This is a joint summary of the reports from the three Astrophysics Program
Analysis Groups (PAGs) in response to the "Planning for the 2020 Decadal
Survey" charge given by the Astrophysics Division Director Paul Hertz. This
joint executive summary contains points of consensus across all three PAGs.
Additional findings specific to the individual PAGs are reported separately in
the individual reports. The PAGs concur that all four large mission concepts
identified in the white paper as candidates for maturation prior to the 2020
Decadal Survey should be studied in detail. These include the Far-IR Surveyor,
the Habitable-Exoplanet Imaging Mission, the UV/Optical/IR Surveyor, and the
X-ray Surveyor. This finding is predicated upon assumptions outlined in the
white paper and subsequent charge, namely that 1) major development of future
large flagship missions under consideration are to follow the implementation
phases of JWST and WFIRST; 2) NASA will partner with the European Space Agency
on its L3 Gravitational Wave Surveyor; 3) the Inflation Probe be classified as
a probe-class mission to be developed according to the 2010 Decadal Survey
report. If these key assumptions were to change, this PAG finding would need to
be re-evaluated. The PAGs find that there is strong community support for the
second phase of this activity - maturation of the four proposed mission
concepts via Science and Technology Definition Teams (STDTs). The PAGs find
that there is strong consensus that all of the STDTs contain broad and
interdisciplinary representation of the science community. Finally, the PAGs
find that there is community support for a line of Probe-class missions within
the Astrophysics mission portfolio (condensed).
