MULTI-ITEM LOT-SIZING WITH JOINT SET-UP COSTS by Shoshana Anily Michal Tzur Laurence A. Wolsey Working Paper No 21/2007 November 2007 Research No. 01270100 This paper was partially financed by the Henry Crown Institute of Business Research in Israel. The Institute’s working papers are intended for preliminary circulation of tentative research results. Comments are welcome and should be addressed directly to the authors. The opinions and conclusions of the authors of this study do not necessarily state or reflect those of The Faculty of Management, Tel Aviv University, or the Henry Crown Institute of Business Research in Israel.