David Allen’s method is a system for organizing your life and getting things done. It is a set of habits that help you make progress on the most important tasks in your life. David Allen's method has been adopted by many people, including entrepreneurs, students, artists, and even some celebrities. He says that the key to productivity is to be organized and have a system in place so you can have the right tools at your disposal when it comes time to work. Although David Allen's method may seem like common sense today, he first developed it in his book "Getting Things Done" back in 2001.