This sublime image is of a tar and gravel roof.
My question for the day is this: Where should the most effort be expended---preventing errors, or establishing a system for fixing errors at all points in a process? Error prevention is preferable from the perspective of a person who is a victim of a preventable error, but it implies a perfect world with perfect operators. Also, what about the errors that don't manifest for a long period of time? How can a prevention system be established without constantly analyzing what is going on?
I favor a revision heavy approach to design and construction. You can't know what could go wrong until you start doing something.
Today, I will be asked to address at least three errors that I bear responsibility for.
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