Work on tasks one at a time, in sequence, until complete
Start with task one and do not move to task two until task one is finished — even if task two feels more appealing in the moment.
Why it works
Sequential execution prevents the partial-progress problem: starting multiple tasks and finishing none. Incomplete tasks impose ongoing cognitive load (Zeigarnik effect) without producing outputs. Sequential completion maximizes the number of tasks that reach done — delivering both the psychological completion reward and the practical output. The list also functions as a commitment that makes skipping a task costly to self-image.
How to do it
- Begin each day with task number one. Do not read email, check messages, or do preparatory tasks first.
- If task one is blocked (waiting on information), move to task two — but return to one the moment the block clears.
- When task one is complete, draw a line through it and move to task two without pausing to review the full list.
Evidence
The cognitive cost of incomplete tasks and the benefit of sequential completion align with the Zeigarnik effect and task-switching research. Single-task execution reduces switching overhead and increases throughput on the items that matter most. (mechanistic)
Task-switching research is mostly on simple tasks in lab settings; the extrapolation to complex knowledge work is principled but the exact magnitude of benefit is not established.
Sources
- Zeigarnik (1938), on finished and unfinished tasks
- Rubinstein, Meyer & Evans (2001), executive control of cognitive processes in task switching, Journal of Experimental Psychology
Common mistake
Treating the list as a menu and choosing tasks based on mood or energy, which defeats the prioritization step entirely — the sequence is the whole point.
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More practices for The Ivy Lee Method, Made Practical
- Write tomorrow’s six most important tasks the evening before
Before the day ends, write exactly six tasks — no more — for the next day, ordered by their importance to you.
- Order the six tasks by genuine importance, not urgency
Rank your six tasks from most to least important — and keep that order fixed through the day.
- Carry unfinished tasks to tomorrow’s list — and evaluate whether they belong
Anything from today that isn’t done goes through the same six-slot prioritization tomorrow, not automatic carry-over.
- Protect the list from same-day additions
Don’t add new items to today’s list when they arrive — log them for tomorrow’s planning instead.
- Make the evening list a non-negotiable daily ritual
The method only works consistently when the evening planning step is a fixed daily habit, not an occasional practice.
Related concepts
- Getting Things Done (GTD), Made Practical
The five steps, the next-action habit, and the science of offloading your mind
- Essentialism, Made Practical
Less but better — the disciplined pursuit of less, trade-offs, and the mechanisms
- The Eisenhower Matrix, Made Practical
The four quadrants, delegation, elimination, and the mechanism behind each move
- Deep Work, Made Practical
Focus blocks, attention residue, and the shutdown ritual — with the evidence