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【正文】 weight methods. Heavyweight methods produce large amounts of official documentation. Heavyweight development methodologies, including the famous ISO 9000, CMM, and the Unified Process (RUP). Lightweight development process is not an official document of the large number of requirements. Lightweight methods, including wellknown Extreme Programming (XP) and agile process (Agile Processes). According to the new methodology in this article, heavyweight method presented is a defensive posture. In the application of the heavyweight methods software organizations, due to a software project manager with little or no involvement in program design, can not grasp the item from the details of the progress of the project which will have a fear, constantly had to ask the programmer to write a lot of software development documentation. The lightweight methods are presented aggressive attitude, which is from the XP method is particularly emphasized four criteria munication, simplicity, feedback and courage to be reflected on. There are some people that the heavyweight method is suitable for large software team (dozens or more) use, and lightweight methods for small software team (a few people, a dozen people) to use. Of course, on the heavyweight and lightweight method of approach has many advantages and disadvantages of debate, and various methods are constantly evolving. Some methodologists think that people should be strictly followed in the development and implementation of these methods. But some people do not have the conditions to implement these methods. In fact, the method by which software development depends on many factors, but subject to environmental constraints. Software development process Software development process, with the subsequent development of technology evolution and improvement. From the early waterfall (Waterfall) development model to the subsequent emergence of the spiral iterative (Spiral) development, which recently began the rise of agile development methodologies (Agile), they showed a different era in the development process for software industry different awareness and understanding of different types of projects for the method. Note distinction between software development process and software process improvement important difference between. Such as ISO 15504, ISO 9000, CMM, CMMI such terms are elaborated in the framework of software process improvement, they provide a series of standards and policies to guide software organizations how to improve the quality of the software development process, the ability of software organizations, and not give a specific definition of the development process. Development of software engineering Agile Development (Agile Development) is considered an important software engineering development. It stressed that software development should be able to possibl
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