I am a city high school principal, getting an enormous amount of paper across my desk, and multiple urgent interruptions during the day. It is very difficult to maintain even a two-minute focus on some days. The weekly review has helped me tremendously but I have had difficulty figuring out how to set up the Projects List. Recently, I have decided to use index cards. I carry them with me, and when I realize I have discovered a project with multiple steps, I start a new index card with the next few steps on the card. These are not necessarily Next Actions but they could be. Then I can transfer any items to context or agenda files, start a folder if necessary for reference materials, and keep track of my Projects by going through the cards on a regular basis. Makes me feels much more confident about having many balls in the air.
I'm still looking for a way to manage Next Actions without it turning into a To-Do list.