根据产品功能规划对零部件层次的零部件成本及质量成本进行设计。
According to the product function layout to design the parts cost and quality cost at the level of assembly parts degree.
九个层次表明人们可以做好每一件事。
它们从更高的层次上描述了用户需要系统帮助他做的每一件事。
They describe, at a high level, everything that the user needs the system to help them do.
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