在满足特定指派要求条件下，使指派方案总体效果最佳。如：有若干项工作需要分配给若干人（或部门）来完成；有若干项合同需要选择若干个投标者来承包：有若干班级需要安排在若干教室里上课等-To meet the specific assignment requirements, so that the overall effect of the assigned program. Such as: certain work to be assigned to certain people (or departments)　certain contracts need to select the number of bidders to contracting: a number of classes need to arrange classes in certain classroom