By marshaling credible and persuasive evidence, influential testers answer three basic questions: How good is the product? What testing did you do? Why is the testing any good? Feeble evidence and the behaviors associated with it are common testing maladies and threats to your ability to tell a compelling story. What are the qualities of strong evidence, and the anti-patterns and risks of weak evidence? Griffin Jones presents the different qualities and types of evidence. We review threats to the credibility and persuasiveness of your work, such as: The danger of false-negative results reported as “pass – as expected”, “Lullaby Language” as an anti-pattern of Lean’s Genchi Genbutsu (go-and-see), the danger of obsessing on efficiency and how it biases the observer. Finally, we show how over-scripted procedures can superficially conceal fatal evidentiary flaws. Be intentional and critical about the type and quality of your evidence. Leave with the skills to recognize and evaluate the dangers and risks, strengths and weaknesses of the evidence you use for your testing story.