traceability assists in managing changes to the requirements that will occur after the requirements are baselined

traceablity can enable faster and simpler impact analysis

requirement management tool can provide large benefits when there is a large amount of requirements

predictive approaches are more formal and controlled

rigid 死板的; 僵硬的; 固执的; 僵化的; 一成不变的; 坚硬的; 不弯曲的; 僵直的;

accountability 责任；有义务，有责任; 衡算计量; （档案） 保管责任;

supplement 增补(物); 补充(物); 添加物; (报纸的) 增刊; (书籍的) 补编，补遗，附录;

invented 发明; 创造; 编造; 捏造; 虚构;