Tiny note for coaches: Most "after action review," a fancy name for you circling up with your staff after practice and asking "how'd that go?" is retrospective and subjective. That is: It's us trying to answer questions that require data we weren't looking for all along. If you ask "Was our defensive spacing better?" but you didn't assign someone to be looking for it all along, you end up with people trying to remember data points about something they weren't really looking at systematically. The answer you're likely to get is, "Yeah, I think it was pretty good." But really that's the group guessing at the answer. Solution: Assign observation tasks to staff members before the session. Align them to your debrief. "Carlo and Michael will you guys be watching our defensive spacing especially during the last two activities. I'll be counting on you to bring some insights about how we did to the debrief." At the debrief you want: "Our spacing was mostly good... 70 percent of the time we were where we should be but we react slowly when the pick up point is higher and Kevin still tends to be too narrow." Bonus: this is a great way to make members of your staff feel important. Good data starts with intentional observation.