The first phase is the requirements phase.

第一个阶段是需求阶段。

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Thinking that this is a traditional requirements phase.

认为这是传统的需求阶段。

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Typically, use cases are elaborated on during the requirements phase of a software project.

通常在软件项目的需求阶段详细描述用例。

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For instance, the Obama team unilaterally decided to phase-in the guaranteed issue requirements of child-only policies, even though the law required this provision to be fully implemented by the fall of 2010.

FORBES: Obamacare Regs Obama Plans to Ignore

The completion of the so-called System Requirements Review and System Definition Review allows program managers to proceed into the rocket's preliminary design phase, NASA officials said.

MSN: Giant deep-space rocket passes key test - Technology & science - Space - Space.com | NBC News