针对需求的分析方法，面向需求的视点方法，需求应该有很多面的视角可以观察到，本文就是描述各个方面的视角

Understanding Requirements of System

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Requirements engineers need to understand many

aspects of the system: (e.g.)

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Services (functions and information) the system must provide

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Application domain of the system

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The users, their backgrounds and biases

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To understand and capture multiple perspectives,

requirements methods must not be a rigidly structured

scheme. (Yet, no structure would be ineffective)

View Point Oriented Methods

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“A Viewpoint is a collection of information about a system

or about a related problem, environment or domain which is

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1. Structured Analysis and Design Technique (SADT)

2. Controlled Requirements Expression (CORE)

3. Viewpoint-oriented System Engineering (VOSE)

4. Viewpoint-oriented Requirements Definition (VORD)

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