making milestone is  very imposible

What do you think about "making milestone is very impossible", could you please further explain this?
Someone said that, to make a milestone is easier than making it real. Do you agree with this statement?
为方便论坛成员讨论，以英文参与之内容将以英文回覆，并附上翻译。

指尖的青烟提到：制定里程碑是非常不可能的。

谈管理回覆：
您提到制定里程碑是非常不可能的，你能够进一步解释你是怎么看待这一观点的吗？
有人说制定里程碑远比实践里程碑来的容易，你同意这样的说法吗？