The most effective thing for me has been social pressure. If I'm working with people who are depending on me to get my work done, I'm more likely to get it done

The most effective thing for me has been social pressure. If I'm working with people who are depending on me to get my work done, I'm more likely to get it done on time. If my coworkers can see my computer screen, then I'll definitely get it done on time, because I'll feel too ashamed to procrastinate. This system falls apart if my coworkers openly procrastinate as well. It is extremely difficult for me to complete projects on my own these days. Luckily, it's relatively easy to find someone to work with on most things that are worth doing.