We discuss some open problems in a program of constructing and studying
two-dimensional conformal field theories using the representation theory of
vertex operator algebras.Comment: 16 pages. Typos are corrected and some sentences are adjusted. Final
version to appear in the proceedings of the Conference on Lie Algebras,
Vertex Operator Algebras, and Related Topics, held at University of Notre
Dame, Notre Dame, Indiana, August 14-18, 201