This document discusses using improv as an analogy for software testing. It defines both improv and testing, noting their similarities in creating or evaluating something spontaneously through experimentation. It suggests following some basic rules can lead to more successful improv performances and testing, such as saying "yes, and", listening, avoiding negativity, knowing the environment, and having performance ideas. Overall, it presents improv as a novel way to think about testing and how certain improv principles can improve testing practices.