通常情况下，制定计划比执行计划更容易。

More often than not, it is easier to make a plan than to carry out a plan.

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你需要制定计划，小心翼翼地执行转换。

You'll have to plan and carefully execute a transition.

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尽管如此，很少有软件项目按照计划执行；最初的和后来的评估都会走样，我们需要频繁的中心制定计划，不幸的是这些计划往往也都过于乐观。

Still, few software projects perform as planned; initial as well as later estimates tend to be way off, demanding frequent re-planning, which unfortunately also tends to be overly optimistic.

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