产品变体：这是一种基于另一种产品但具备一些不同特性的产品。
Product variant: This is a product that is based on another product but with some different characteristics.
为了及时交付一个可使用的产品，您在管理这个项目范围时将会删除一些特性。
You end up removing some as you manage the scope in order to deliver a usable product on time.
我认为史蒂夫·乔布斯也是这样做的，他是从愿景而并非是一堆产品特性中开始设计的。
I think that's what Steve Jobs does. He starts with a vision rather than a list of features.
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