Getting Things Done is a method for productivity and organization. It involves emptying your brain of all tasks and projects by writing them down, then determining if each item requires action or no action. Items that require no action are filed, binned, or incubated, while items that require action are done immediately, delegated to someone else, added to a next action list or project list. Maintaining next action lists and a tickler file system with 43 folders is essential for staying organized and completing tasks.