必须在项目发起人和项目组长之间存在单通道通讯，从而使得所有的决策能够影响到整个产品。
A single channel of communication must exist between the project sponsor and the project team leader for all decisions affecting the product scope.
对于任何升级，在进行产品升级之前，都必须在环境中全面测试该升级，从而将对用户的影响减少到最小。
As with any upgrade, you must test it thoroughly in your environment before upgrading in production to minimize impact to your users.
如果某个文档需要添加一个新字段，它仅需包含该字段，从而不影响到数据库中的其他文档。
If a document needs to add a new field, it can simply include that field, without adversely affecting other documents in the database.
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