We suggest you keep your system as simple as possible, but no simpler, as Einstein says. The most complex-looking part of the process is the set of various lists for next actions (at phone, at computer, at the office, at my boss, etc.) But there’s method to that madness. If you buy into the best practice of tracking everything you have attention on, you will probably have over 100 next actions. Sorting them into separate lists by context actually makes it easier to review what you can do at any point in time. In other words, when you’re out and about with a mobile phone, you would rather see one list of calls to make instead of having to find them all on a big list of all your actions grouped together.