行文顺畅、清晰，虽然有点啰嗦，原文在这里。
核心概念定义如下：
When describing system development, some form of distinction is commonly made between
concepts, needs and requirements.
Concepts are typically narrative descriptions of ways in
which the organization (and entities within an organization) expects to manage, acquire,
develop, operate, support, and retire the business capability.
Needs are formal statements of
expectations for an entity stated in the language and perspective of stakeholders. Needs are
transformed into requirements through a process of requirements analysis (which is also called
business analysis or mission analysis at the higher levels)—there may be more than one
requirement defined for any need.
Requirements are formal textual statements that
communicate what an entity must do to realize the intent of the needs.
各个概念之间的关系：
注意这些动词，transform，validate/verify —— 尤其是satisfy对应了两个动词，是不同层面的验证satisfy。
再次往下，关注needs和requirements的关系：
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