We discuss the spectrum of states of IIB supergravity on AdS(5) x S-5
in a manifest SU(2, 2/4) invariant setting. The boundary fields are de
scribed in terms of N = 4 superconformal Yang-Mills theory and the pro
posed correspondence between supergravity in AdS(5) and superconformal
invariant singleton theory at the boundary is formulated in a N = 4 s
uperfield covariant language. (C) 1998 Elsevier Science B.V.