“协同筛选”的工作仅仅针对所有可用的数据，而人类却是制造那些杂乱无章、低质量数据的始作俑者。

Collaborative filtering works only as well as the data it has available, and humans produce noisy, low-quality data.

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这会导致没有可用的工作软件，直到周期的晚期才会改变。

This results in no working software until very late in the cycle.

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这可用作将来的所有工作的参考。

This serves as a reference for all further work.

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