The Case for a James Webb Space Telescope Extragalactic Key Project
  The upcoming launch of the James Webb Space Telescope (JWST) in less than
three years is certain to bring a revolution in our understanding of many area
of astrophysics, with one of the key goals being galaxy evolution. As the first
proposals will be due in a little over two years, the time is ripe to take a
holistic look at the science goals which the community would wish to accomplish
with this observatory. Contrary to our experiences with the Hubble Space
Telescope, which has now operated successfully for over two decades due to
several timely servicing missions, the lifetime of JWST is finite and
relatively short, with a lifetime requirement of five years, and a ten-year
goal. Following the discussion session at the "Exploring the Universe with
JWST" conference at ESA-ESTEC in October 2015, we highlight in this document
the (non-local) extragalactic science goals for JWST. We describe how a
concerted community effort could best address these, ensuring that the desired
survey can be completed during the JWST mission.
