Several lot sizing rules exist to aid managers in the decision-making process as it pertains to determining the appropriate lot size in a materials requirements planning system! The literature in this area has almost exclusively focused on the single-level lot sizing problem. In this paper, the multi-level lot sizing problem is examined. This study consists of six different demand patterns (master schedules) and four different lot sizing rules. The rules are economic order quantity, least total cost, lot for lot and period order quantity. The study looks at these rules in combination. Therefore, sixteen different lot sizing sequences are examined for each of the six forecasts. Conclusions are drawn as to the relative efficiency of the lot sizing sequences, and suggestions for further research are made.