The Requirements Definition phase determines the what of the design: what information and capabilities our personas require to accomplish their goals.
在需求定义阶段确定的是设计什么，即我们的用户角色需要什么样的信息和能力来完成他们的目标。
Based of a definition of requirements volatility and literature review, the causes and impacts of RV on information system project performance were summarized, 28 volatility factors were proposed.
论文首先从需求波动的定义和文献综述出发，总结了需求波动形成的原因及影响，获得了28个波动风险因素。
Information and data indicate that this product meets the requirements of this definition (see next section). An example of the US label is included as Attachment 1.
数据显示该产品符合定义标准（见下一章）。附件一为美国商标样本。
Information and data indicate that this product meets the requirements of this definition (see next section). An example of the US label is included as Attachment 1.
数据显示该产品符合定义标准（见下一章）。附件一为美国商标样本。
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