Quote from naifwonder:
I can also run the basics of my back-test criteria through my head, and usually do before I code something. However, for running more advanced tests with more extensive calculations, you'd most likely need software, or at the least, something to write on. Even a savant would have trouble running advanced system testing calculations strictly mentally.
If you can run your back-test mentally, chances are that you need to improve what you consider testing.
