Retrospectives. If you were to chart the most valuable but least practiced meetings, the hands-down winner would be something called a retrospective. A retro is simply a chance for any team to stop, notice, and learn. After a big push of work, or ideally on a regular interval, the team will gather for an hour or two and share their perspectives on what happened, what stood out to them, and what they ultimately learned. The goal is simple: to do better next time. Many forms of retrospective exist, ranging from the simple (mapping highs and lows over the time line of the project) to the more complex (four Ls: liked, learned, lacked, longed for).
Aaron Dignan in Brave New Work