"I developed it with James Watkins who directed The Woman In Black, and we call it the Fassbender test. If you're ever being asked to do anything, you just ask yourself a question: 'Would Michael Fassbender do it?' This referred to a moment when I was being asked to do something a bit more corporate than I'd ever done before, and it came down to the Fassbender test, and we thought he wouldn't do it. It's a pretty good test for a lot of young actors." Daniel Radcliffe uses fellow actor Michael Fassbender as a guide for his own career.