The authors of the following discussion notes have been working on causation for about 40 years. Woodward’s work culminated in his book Making Things Happen (OUP 2003), Spohn’s work culminated in chapters 14 and 15 of his book The Laws of Belief (OUP 2012), which have almost book-length. Prima facie, their accounts look quite similar; the interventionist theory of causal Bayes nets seems to be their common ground. Therefore, it is important to also see their differences. These are explained in the notes, which mutually discuss their theories of causation. The exchange originates from an Author Meets Critic session at the APA meeting in Baltimore in January 2017
