By my translating the exchange 2007 unleashed book, I found some noun about project phases. A number of documents are produced during each phase to ensure that the phase is well defined and ultimately successful.

There are four phase following: INITIATION, PLANNING, TESTING, and PILOT. By the initiation phase, the goals and requirements of the project can be identified and documented in a Statement of Work document. Other phase need the document that like Design document within planning phase, Project Schedule and Migration documents and so on.

What's mean about the SOW?

A statement of work (SOW) is a document used in the Systems Development (with ICN) Life Cycle. An organization desiring to have work done (i.e., the prospective customer) produces an SOW as part of a Request for Proposals. Software vendors or services companies (prospective contractors) respond with Proposals. The SOW specifies requirements at a very high level. Detailed requirements and pricing are usually specified at a later stage.

——quote from WIKI

More information about the SOW, follow this link:

http://en.wikipedia.org/wiki/Statement_of_work

什么是工作陈述？

没有工作陈述(SOW)任何严肃的项目策划都难以开始。SOW既是一份概要,在很高的层次上说明项目的用途,范围与途径。SOW帮助你沿着正确的方向安排策划工作。SOW通常包括:对项目技术的目标与宗旨的描述,必须满足的成本和进度方面的约束,实际存在的资源约束,以及客户与供应商在开始时应该理解的有关假定。实际上,SOW是客户与供应商之间的高层共识,是按确定的路线开展项目策划工作的一份协议。

工作陈述的内容

1、范围陈述（系统的目的与范围陈述）
2、约束陈述（包括开发和实施知识管理体系的成本预算、完成的时间、具体质量陈述等)
3、责任陈述（包括知识获取和工具选择的责任问题）
4、要求陈述（比如客户要求）
5、交付使用陈述（比如陈列、培训、文件）；签名（包括项目经理、项目发起人、客户）等

工作陈述的三个特征

1、工作陈述是一份简短的文档。它既不是一份设计文档,也不是一份完整的法律合同。它应该是在高层商抓住要点。SOW的作用是奠定工作范围,开始定义最终产品。
2、保证客户与高层管理者能充分评审并批准工作陈述,然后才有可能切实地着手进行项目的其他活动。
3、一份工作陈述获得批准,便应对这份文档进行版本控制,并将它作为软件项目计划的一部分。

Then, wish your need, hope this can help you.