The One-Rabbit Rule
Updated: 4 days ago
In this Neuroscience Publication
Chase two rabbits and both escape. The UNOP library uses that image for your study hours, and the One-Rabbit Rule is the follow-through: name the one task for this block, close every other rabbit, park the second task on paper, then work with a single thing in front of you.
The One-Rabbit Rule
How to Do It
Five moves: three minutes of setup, one block of work, one minute to close.
Name the one rabbit (30 seconds). Decide the single task for this block and say it in one line: read section 3 and take notes. If two tasks feel urgent, pick one; the other goes on the list in a moment.
Close every other rabbit (1 minute). Close the other tabs, documents and apps; put the phone out of reach. If the messenger must stay open, close the windows that ping.
Park the second task on paper (1 minute). Write each waiting task on one line of a parking list: the message to send, the errand you remembered, plus where you stopped. A line each is enough to resume without thinking.
Work the block (20 to 25 minutes). One task only. When a thought about something else arrives, write it on the parking list and return to the page. The list grows; the desk does not.
Close the loop at the end (1 minute). Read the parking list and choose what comes next. The list opens your next session; nothing on it has been lost.
That is the trade: one rabbit, and a list that holds everything you did not chase. The 25-5 Rhythm puts this block on a clock; The Nightly Brain Dump runs the same parking move across a day.
The One-Rabbit Rule
The 5M2S Key Point
Chase one rabbit: park the second task on paper before the block, and keep one thing in front of you while it runs.
The One-Rabbit Rule
Origin
The practice belongs to the UNOP library. The base principles guide sets a rule for the two hours you dedicate to study each day: for the vast majority of people, the brain cannot do several things at once satisfactorily, so that time closes to television, notifications and messages. The guide makes the point with a popular parable: a hunter who chases two rabbits at once loses both. The One-Rabbit Rule is that instruction as a three-minute setup. Deep Focus Starter: The Pomodoro Warm-Up (Rule 08) starts a sprint with a clear intention and a clean desk; this rule keeps both clear once the sprint runs.
The One-Rabbit Rule
Science-Backed
Switching costs time, even between simple tasks. In four experiments, participants alternated between two tasks or repeated one; in the simplest pair, each switch added about 1.1 seconds to the response, the cost grew with harder rules, and it shrank when a cue announced the next task (Rubinstein, Meyer and Evans, 2001).
An unfinished task follows you into the next one. Sophie Leroy's experiments found that people cannot fully move their attention off an unfinished task, and their performance on the following task suffers; finishing first was not enough, and disengagement improved when the finish happened under time pressure (Leroy, 2009).
A written plan releases the unfinished task. Students reminded of an unfinished goal showed intrusive thoughts and worse reading comprehension; those who wrote a specific plan for when and where to act on it reported no more intrusions than a control group (Masicampo and Baumeister, 2011).
The price of an interruption often shows up as stress, not lost time. In an office simulation, 48 participants answered emails with and without interruptions every two minutes: interrupted work was completed slightly faster, with no more errors, but with significantly higher stress, frustration and effort (Mark, Gudith and Klocke, 2008).
What the evidence does not show: none of these studies tested this exact reset, the tasks are short laboratory tasks rather than a full course, and closure was tested by finishing or planning, not by writing a parking note. Take the rule as the cheap default: one task at a time.
The One-Rabbit Rule
Sources
All sources below were opened and read on 16 October 2026.
UNOP library. The base principles guide and the two-rabbits parable. University 365 library.
Rubinstein, Meyer and Evans (2001). Executive control of cognitive processes in task switching. Journal of Experimental Psychology: Human Perception and Performance, 27(4), 763-797.
Leroy (2009). Why is it so hard to do my work? Organizational Behavior and Human Decision Processes, 109(2), 168-181.
Masicampo and Baumeister (2011). Consider it done! Plan making can eliminate the cognitive effects of unfulfilled goals. Journal of Personality and Social Psychology, 101(4), 667-683.
Mark, Gudith and Klocke (2008). The cost of interrupted work: more speed and stress. Proceedings of the SIGCHI Conference on Human Factors in Computing Systems (CHI 2008), 107-110.
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