This method is very effective for me however when I have a few minutes to do things I'd forget what I need to do and what I can do in such little time.
I found that if I start with a list of things that I need to do - both the small things and the big things, I can refer back to it and easily find something perfect for the amount of time I have.
Having a to-do list is a most. I have found that it helps the mind focus a lot better. Can easily save you a lot of time having to remember all the things that you have to do.