I do make a list for my work and study. By doing so, my efficiency at work or study could be improved, undoubtedly. Besides, I will be clear about what I am going to do next. Normally, I write down my list in person. There is a notebook which has been with me for years. All of my work could be shown on it. That's been a part of my working habit, and I have been doing this for long time, I mean, quite effective to me.