All procrastination is delay, but not all delay is procrastination. […] Procrastination is the voluntary delay of an intended action despite the knowledge that this delay may harm the individual in terms of the task performance or even just how the individual feels about the task or him- or herself. Procrastination is a needless voluntary delay.
- From “Solving the Procrastination Puzzle: A Concise Guide to Strategies for Change”
Timothy A. Pychyl