上山过程分成三段：思考、验证、确认。

探寻你的攀爬之道
Some teams struggle with backsliding when they first try the hill chart. They consider a scope solved, move it the top of the hill, and later have to slide it back when they uncover an unexpected unknown.

When this happens, it’s often because somebody did the uphill work with their head instead of their hands. Coming up with an approach in your head is just the first step uphill. We often have a theory of how we’ll solve something—“I’ll just use that API”—and then the reality turns out to be more complicated. It’s good to think of the first third uphill as “I’ve thought about this,” the second third as “I’ve validated my approach,” and the final third to the top as “I’m far enough with what I’ve built that I don’t believe there are other unknowns.”
一些团队在初次尝试山形图时会遇到进度回退的情况，当他们认为一个分区已经完成后，就将定位移动到了山顶。但是后续遇到了一些意料之外的问题让他们又不得不将其进行回退。
发生这种情况往往是因为有些成员光想不做。在大脑中想出一个方案只是上山的第一步。要找到一个解决方案是很容易的——「我只用那个 API」，但是事实证明现实往往会比预想更加复杂。最好的方法就是，把上山分为三段，前三分之一是「我已经考虑过了」，中间部分是「我已经验证了」，最后三分之一则是「我想清楚了，也验证了，不会再有意外了」。