Sequential or big-design-up-front (BDUF) models, such as waterfall, focus on complete and correct planning to guide large projects and risks to successful and predictable results.
顺序模型或预先大量设计模型（BDUF）、如瀑布模型、关注于完整和正确的规划来指导大型项目、估计取得成功的风险，保证结果的可预测性。