Set a deadline for tasks without an external deadline

Cost: No cost involved. The hard part is actually sticking to the deadline you set. If you ignore it when the day arrives, it’s as if you never set it at all.
In plain terms: When there is an external deadline, 80.6% of students manage to finish their work before it. But only 38.7% finish within their own estimated timeframe. The actual completion time is almost entirely determined by the external deadline, with little connection to their own estimates. That’s why it’s crucial to set your own deadline for tasks with no external deadline, and then follow through on it.
Benefit: For students with an external deadline, 80.6% complete their work before it. Meanwhile, only 38.7% finish within their own estimated timeframe. The actual completion time closely aligns with the external deadline, with a correlation coefficient of r = 0.82 — the closer this number is to 1, the tighter the alignment. There is only a very weak link between completion time and students’ own estimates.
Evidence grade: B
Sources:Buehler, R., Griffin, D., & Ross, M. (1994). Exploring the "planning fallacy": Why people underestimate their task completion times. Journal of Personality and Social Psychology, 67(3), 366–381. https://doi.org/10.1037/0022-3514.67.3.366
Notes: Telling others about the deadline you set for yourself makes it behave more like an external deadline. It’s worth noting that this research only proves external deadlines are effective. For self-set deadlines such as time-boxing or using Pomodoro timers, no direct studies have been conducted, so this conclusion is drawn by inference.