More on the dangers of success

Further to the Fred Brooks quote from a few weeks ago, this one from Pixar's Ed Catmull: "Success hides problems."

When I was growing up, my mom would say to me that I should go over the problems I got *right* as well as the ones I got wrong, because if it's wrong, I'll try to fix it, but if it's right, I might have problems I didn't see at first.