The master production schedule (MPS) is generated by Annie Yee, the Planning Manager. She takes the forecast developed by marketing by litres by month by product and converts this into boxes (or inner containers). Given line capacities and warehouse capacities and a number of decision rules -- such as aiming at having 30 per cent of the annual inventory requirement in the plant warehouses by the beginning of the second quarter -- she creates the MPS. It is regenerated every week on a rolling 13 week basis.