If you learn a lesson, you are unlikely to repeat the mistake you made. Consider this like turning on a flashlight while walking around in the dark. It helps you avoid running into a piece of furniture.
If you learn a lesson and share that lesson with others, your colleagues, your outside law firms and more can learn and avoid the mistake you made. This is akin to turning on bright overhead lights so everyone avoids running into a piece of furniture.
While this is really an obvious insight into the obvious, there are roadblocks that get in the way of making it so. I’ve written about some of these before (in my New Normal column)–I encourage you to read the comments because they illustrate the problem as well as anything. My next column is going to talk about the value of lessons learned from the client’s perspective.