The Acordis acrylic fibres plant in Grimsby operates thirteen production lines, extruding four basic polymer types to make fibres. There are twelve key variables which define the end product. All changes to these variables take time (some more than others) and low grade product or waste is produced during the changeover. The most common product change is in the fibre colour. We believe that optimised production scheduling can reduce the number or duration of the changes. Production scheduling is currently carried out by one skilled person who has to consider both production issues and customer requirements. We are looking for a tool to both help the scheduler and assist the production team leaders who periodically have to re-jig the production schedule outside of day hours and at short notice.