Confirmation bias is our human nature tendency to look for information that confirms our beliefs. Suppose you don't like one week sprints. You're convinced they're too short. If you're going to hear, let's say, eight anecdotes about the evils of one-week sprits while you are here at this conference, you'll hear just as many anecdots about evills of sprint of any other length. But because you're looking for it, you'll be more attuned to noticing the problems with one-week sprints. A couple of years ago, my daughter decided to buy a car. She wanted to by a Nissan Juke. she was convinced she is the first person to discover that car, but between deciding to buying one and actually buying, she started to notice them everywhere. This is confirmation bias. We need to be aware of this because confirmation bias convinces us that things we believe are true, even though they may not be. Nissan Juke's were not suddenly everywhere. My daughter was just more observant of them. One-week sprints do not create more problems. But if you think they do, you're likely to notice that more while you are here. When you go back to the office, You'll be more convinced than ever that one- week sprint cause more problem than sprin of any other length.