Don’t underestimate their significance 1. Correlation ≠ Causation An oldie and a goodie. Oft-cited, almost as frequently misunderstood. Compare: “We changed to 1-week sprints and sign-ups went up” “Sign-ups went up because we changed to 1-week sprints” “When we have shorter sprints, sign-ups go up.” Easily confused with each other, the differences are important…