The original title of this talk is "Agile Testing, Uncertainty, Risk, and Why It All Works." That's still the topic of this talk, however after hearing so many misconceptions about testing simply because the name "Test" carries so much baggage in our industry, I decided to reframe my talk so as to avoid using the word "Test" at all in the first half. Instead, we'll focus on how fast feedback supports learning and empirical evidence trumps speculation.