Attention & Focus
Parkinson's Law
Work expands to fill available time.
In practice
Takeaways
- 1
Open-ended tasks feel heavier than bounded ones.
- 2
Set expectations for how long a flow should take.
- 3
Constrain inputs when brevity is the goal.
Origins
Parkinson’s Law observes that tasks grow to consume the time allotted to them. In interfaces, unbounded text fields, vague prompts, and endless configuration can make simple jobs feel exhausting.
Clear constraints help users start, finish, and move on.
Design Applications
- Use character counts for summaries and messages.
- Break large jobs into timed or numbered steps.
- Autosave so users are not afraid to pause and return.
Frequently Asked Questions
Further Reading
Related Principles
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Interaction & Behavior
Goal-Gradient Effect
Motivation increases as users get closer to completing a goal.
Learn more ›
Memory & Recall
Zeigarnik Effect
Incomplete tasks stay in memory better than completed ones.
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Interaction & Behavior
Doherty Threshold
Productivity peaks when system response stays under ~400ms.
Learn more ›Tools worth a look
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