Procrastination back in the fourties
There is a hilarious short story from Robert Benchley that was published in 1949 (four years after his death) and is about how you can be very productive doing all kinds of things, when you should be working on something else.
The psychological principle is this: anyone can do any amount of work, provided it isn’t the work he is supposed to be doing at that moment.
The article, apart from being humorous and well written shows that productivity is best served by using your intuition when picking the next action.