The Systems Development Life Cycle (SDLC) is a process of creating or altering information systems， and the models and methodologies that people use to develop these systems. Sequential SDLC models， such as （）， focus on complete and correct planning to guide large projects and risks to successful and predictable results.
系统开发生命周期（同步）过程是一个创造或改变信息系统，以及模型和方法，依据模型按顺序开发这些系统如瀑布模型，注重完整和正确的规划指导大型项目和风险的成功和可预测的结果。 A选项：瀑布模型；B选项：极限编程；C选项：螺旋模型：D选项：快速原型