Let ' s continue to follow the gps tracking system example , this time assuming that we need to add an entirely new capability ( macrolevel change ) requirement for the prestige car market : giving verbal directions to the user 让我们继续gps跟踪系统的例子，这次我们假设我们需要增加一个全新的功能（粗粒级的变更）需求来满足高档车市场：给用户提供文字提示。
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We may distinguish between the macrolevel and icrolevel in a number of ways , but it is perhaps easiest to categorize macrolevel changes as those that are visible from a project management or end - user viewpoint : key features , performance improvements , and so on 我们可以通过多种方式区分粗粒级和微粒级变更，但也许最容易区分粗粒级变更的方式是从一个项目管理者或最终用户的角度去看整个系统的功能：关键功能，性能优化等。
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