There's no one answer that's right for everybody. It depends on how you like to work and what your tools are. If you have an electronic list tool that is ubiquitous, then you might want a tickler list there. If you only need to see ticklers at one location, then paper or electronic may not matter so much. If you get a lot of information on paper (pages of information) that you don't want/need to make electronic, then paper. Some people use a specialized tickler system for work stuff, either paper or electronic. Try a few things and see how they feel. It's not so complicated. Just be careful to retrieve any ticklers from a system that doesn't work for you and put them in the system you are using.