1. A method for generating a bid invitation, comprising: querying a prospective purchaser for an item that said prospective purchaser may want to purchase and an attribute of said item; providing said prospective purchaser with at least one set of importance fuzzy variables to select from to describe said item or said attribute of said item; querying said prospective purchaser for a possible value of said attribute; providing said prospective purchaser with a set of degree of satisfaction fuzzy variables to select from to describe said possible value of said attribute; generating said bid invitation using responses to queries and selections; and submitting said bid invitation to possible suppliers to notify said suppliers of the opportunity to submit a bid responsive to said bid invitation.