Nonlinear programming methods are used to create effective drying schedules for boards. A two-dimensional. orthotropic drying model is connected to an optimization routine that solves convex sub-problems. The iterative optimi7ation program calculates the drying schedule. i.e. the variation of temperature and humidity with time, that gives the shortest drying time for a board with prescribed upper and lower level of the moisture content. To demonstrate the capability of the technique. numerical results are presented.