由于技术的发展速度快于业务的发展速度，系统会陷入遗留状态：寿险系统通常必须在数十年内保持数据和功能，因此用于构建系统的大部分技术都已过时。运气好的话，系统不必再更新，因此 IT 部门可能会倾向于 "让它继续运行"，遵循 "永远不要触碰运行中的系统 "这一流行建议。
传统 IT 部门有时会以必须支持业务为由为自己的僵尸系统辩解：你怎么能关闭业务可能需要的系统呢？他们还认为，数字公司不存在这样的问题，因为它们太年轻，没有积累遗留问题。150 名谷歌开发人员参加了迈克-费瑟斯（Mike Feathers）关于 "有效处理遗留代码"（Working Effectively with Legacy Code）的讲座。1演讲的 150 名谷歌开发人员可能会让我们对这一假设产生怀疑。由于谷歌的系统发展迅速，他们积累遗留问题的速度也比传统 IT 部门更快。因此，他们并不是因为没有遗留问题而得天独厚，他们一定是找到了处理遗留问题的更好方法。
害怕改变
由于不随技术的发展而发展，系统 变成了传统的僵尸。这种情况之所以会发生在传统的 IT 系统中，主要是因为变革被视为一种风险（第 26 章）。再次强调，"永远不要触碰运行中的系统"："系统的发布基于大量的、通常是人工的测试周期，这些测试周期可能长达数月，这使得更新或变更成本高昂。更糟糕的是，没有更新系统技术的 "商业案例"。这种普遍的逻辑就像认为更换汽车机油是浪费钱一样--毕竟，不换机油，汽车照样能跑。
大多数 事情之所以如此，都是有原因的。企业 IT 部门对变革的恐惧也是如此。这些企业通常缺乏工具、流程和技能来密切观察生产指标，并在出现问题时迅速部署修复措施。因此，他们试图在部署之前测试所有情况，然后或多或少 ...
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