There’s a lot to learn about A/B and multi­vari­ate testing, and a lot of debate about whether (and when) to use each. But don’t fret! This post seeks to clarify issues surround­ing both…

Several years ago, in a small confer­ence room with a view of the Pacific, I was talking opti­miza­tion with 17 others at the XChange confer­ence. The conver­sa­tion was lively, educa­tional, and zingy in that way that makes a person want to collab­o­rate and…