  Detailed studies of four dimensional N=2 superconformal field theories (SCFT)
defined by isolated complete intersection singularities are performed: we
compute the Coulomb branch spectrum, Seiberg-Witten solutions and central
charges. Most of our theories have exactly marginal deformations and we
identify the weakly coupled gauge theory descriptions for many of them, which
involve (affine) D and E shaped quiver gauge theories and theories formed from
Argyres-Douglas matters. These investigations provide strong evidence for the
singularity approach in classifying 4d N=2 SCFTs.
