# 一种项目三角形的解释法
一直以来，项目三角形的解读大概是这样：
一种认为范围不变，可以变的是时间和资源投入，这是传统的说法。
另一种认为是时间和资源不变，范围可变，这是DSDM的说法，也是敏捷圈常用的说法。
在今年的经历之中，发现我们经常被cue的其实是：
* 到底能不能按时上线
* 资源还缺多少
* 需求怎么老是澄清不完
* 为什么需求老在变
* ……
这说明，有一种可能是时间不变的。
当然资源不变的情况也是有的。
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