Contents: H. Brezis: Sk-valued Maps with Singularities.- L.A. Caffarelli: Free Boundary Problems. A Survey.- J. Moser: Minimal Foliations on a Torus.- L. Nirenberg: Variational Methods in Nonlinear Problems.- R.M. Schoen: Variational Theory for the Total Scalar Curvature Functional for Riemannian Metrics and Related Topics.- A.J. Tromba: A Classical Variational Approach to Teichmüller Theory.