Url https://chloe.cnr.it/s/DHeLO/item/14387 Resource class bibo:AcademicArticle Creator Ackoff, Russell Date 1989 Language eng Is Part Of Journal of Applied Systems Analysis Pages 3-9 Volume 15 Homepage https://www.zotero.org/groups/5293298/bidiar/items/I4EUCIML/item-list --