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        <description>需求评估

在设计需求的时候，应该考虑的节点：

	*  是否影响商务逻辑：aka，帮用户省成本后，商务怎么办？
	*  是否影响安全审核：aka，新增了输入方式，是不是应该加一道安全审核。
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用户产品

	*  演进的根本驱动力：追求方便的天性
	*  产品的设计原则：更简单、直观、快捷
	*  发展趋势：产品趋于简化，理解和操作成本低

商业产品

	*  演进的根本驱动力：优化商业利润</description>
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