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Simulating a manufacturing operation often has surprising results. The author explains how a window manufacturer improved its processes. The production scheduling and operations management issues faced by a window manufacturer will be universally recognised by manufacturing engineers from all sectors. The processes may be different, but the end result - a quality product made in the shortest possible time and at the lowest cost - is the same. Simulation modelling is seen as a way of analysing dynamic systems that exhibit variability. Before experimental analysis of the simulation model can begin it is necessary to ensure that the model constructed provides a valid representation of the system. This process consists of verification and validation of the simulation model.