Quote Originally Posted by TesTeq View Post
Easy! One at a time. No multitasking, please!

At any given second of your life you are working on one project only - everything else is safely parked in your trusted GTD system. David Allen often refers to a kung-fu street fighting - deal with one enemy at a time!
Not entirely true- it's possible to do a next action which is part of two or more projects. For example I might make mushroom soup (next action) because I want to use up some leftover mushrooms in the fridge (project 1) and try out a new recipe for mushroom soup (project 2).