  We assess which Kahler potentials in supergravity lead to viable single-field
inflationary models that are consistent with Planck. We highlight the role of
symmetries, such as shift, Heisenberg and supersymmetry, in these
constructions. Also the connections to string theory are pointed out. Finally,
we discuss a supergravity model for arbitrary inflationary potentials that is
suitable for open string inflation and generalize it to the case of closed
string inflation. Our model includes the recently discussed supergravity
reformulation of the Starobinsky model of inflation as well as an interesting
alternative with comparable predictions.
