You have to know what the goal is. The aim was to make it a success in many ways, such as 1 + 1 = 2 and 5-3 = 2 are the same, so everything changes all the time.
You need to know what the goal is, then to accomplish it, there are several ways, such as 1 + 1 = 2 and 5-3 = 2 identical. So everything changes at any time.