Abstract: A model for PWB production planning and equipment changeover scheduling in multi-product, flexible manufacturing environment at the aggregate level is developed. Since the model is a large-scale mixed integer programming problem, solution algorithms are described, which first solve a recursive linear programming problem to obtain a rough set of machines to be added, a rough set of machines to be removed and thus a rough set of machines to be transferred for each machine line in each period, then apply a depth-first heuristic to the rough sets to obtain near optimal solutions to the equipment changeover scheduling problem. Computational study shows the efficiency of the algorithms.