You probably don’t need an actual ledger to measure the costs and benefits of your tests (This is a sidebar to an email course called Noel Rappin’s Testing Journal that you can sign up for here. It relates to the content of the email course, but didn’t quite fit in. If you like this post, you’ll probably also find the course valuable. You can also hear me discuss similar topics with Justin Searls and Sam Phippen on an episode of the Tech Done Right podcast.) I often find myself refer...