A fixed price contract means a construction contract in which the construction price is ascertained on the basis of a fixed contract price or a fixed unit price.
合同是不同机构间的粘合剂，但传统的合同是基于“不信任”和“自保”哲学，而且定额合同（fixed price contract）也未考虑软件开发的不确定因素。
It is also interesting that they both [Agile and traditional shops] deliver software under fixed price contracts.
