Actually this post from that same blog (to me) correctly summarizes the Kata exercise: http://pindancing.blogspot.com/2009/09/sudoku-in-coders-at-work.html http

Actually this post from that same blog (to me) correctly summarizes the Kata exercise: http://pindancing.blogspot.com/2009/09/sudoku-in-coders-at-work.html http://pindancing.blogspot.com/2009/09/sudoku-in-coders-at-w... Specifically Norvigs quote in the blog: "I see tests more as a way of correcting errors rather than as a way of design. This extreme approach of saying, Well, the first thing you do is write a test that says I get the right answer at the end, and then you run it and see that it fails, and then you say, What do I need next? that doesn’t seem like the right way to design something to me."