Sometimes you use systems to measure things that can't be measured, because that's better than not measuring anything at all.

The writer's daily wordcount is a great example of this. We know, as writers, that you can have a great writing day which only results in 12 words, if they're the right words at the right time, and you can have a rotten writing day and still produce 3000 words (which may in fact have to be disposed of in a seedy back alley somewhere later). We know that setting a...