什么是Twin Peaks Model?
其实是说，需求与架构的zigzag展开：
为什么要zigzag展开？为了避免瀑布式开发带来的闭门造车：
In practice, this often results in a classical waterfall model: First,
requirements are specified and then the architecture is developed based
on these. This approach may lead to problems. For instance, requirements
are derived that can’t be implemented with the existing technology. Or
the architecture is assembled piecemeal from individual components,
performs poorly, and doesn’t fulfill stakeholders’ expectations.
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