This volume comprises selected papers presented at the IFIP WG 7.2 Working Conference on Boundary Control and Boundary Variation held in Sophia-Antipolis, France in October 1990. From the contents: A. Bensoussan: Exact Controllability for Linear Dynamic Systems with Skew Symmetric Operators; P. Cannarsa and F. Gozzi: On the Smoothness of the Value Function Along Optimal Trajectories; D. Cioranescu and J. Saint Jean-Paulin: Truss Structures: Fourier Conditions and Eigenvalue Problem; G.da Prao and J.P. Zol sio: Boundary Control for Inverse Free Boundary Problems; R. Glowinski: Boundary Controllability Problems for the Wave and Heat Equations; R. Triggiani: Regularity with Interior Point Control.