主题专家（用户）
该练习的关键是设计和开发过程中主题专家和业务用户的参与。
Key to this exercise is the engagement of the subject matter experts and the business users in the design and development process.
主题专家可能不得不和若干开发人员小组一起工作，从而增加了他们的负担。
Subject matter experts may have to work with several groups of developers, increasing their burden.
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