While technology is great, it can tie us down or even make us less productive, as you spend time attempting to get the latest app to sync with the rest of your system or several minutes updating the app(s) with your progress.
Sometimes the simplest things are still the best - such as pen and paper.
Pen and paper also has the advantage that you're engaging different parts of your brain when you write something down.
It also has the advantage that if technology fails, pen and paper will always be there. It won't run out of battery and you don't have to worry about whether you can get a signal or not.
Carry a note book with you to jot down notes, brainstorm ideas, create lists for your tasks.
Pen and Paper (Photo credit: Guudmorning!)