One of the biggest planning mistakes people make is to treat the unlikely as impossible.
from Deferred Consumption, Better Living Through Statistics
When we're laying out the Integrated Master Schedule and assigning risk categories and levels of risk within those categories, there is always a tendency to say "we'll this risk is such a low probability, that I'll just skip over it."
Now an IMS with every conceivable risk is not much use in practice, but without knowing why you rejected a specific risk, is itself a risk. You have to know WHY, before you can saw NO.
