Differential stability of projection in Hilbert space onto convex set. Applications to sensitivity analysis of optimal control problems.- Sensitivity of solutions to convex optimal control problems for parabolic equations.- Parametric optimization problems for evolution initial - boundary value problems.- Finite element approximation of an optimal design problem for free vibrating plates.- The design of a two-dimensional domain.- Numerical treatment of variational inequality governing multidimensional two-phase stefan problem.- Improvement of an algorithm for the computation of optimal control.- Quasi-optimal feedback for linear differential games.- Suboptimal strategies for Nash nonlinear differential games.- Quasi — Subgradient algorithms for calculating surrogate constraints.