[ThinkBetter](https://thinkbetter.app/) → [Mental Models](https://thinkbetter.app/mental-models.md) → Parkinson's Law

# Parkinson's Law

Work expands to fill the time available for its completion.

![Parkinson's Law illustration](https://assets.thinkbetter.app/images/parkinsons_law.png)

Imagine you have a week to complete a report. Even if it could be done in a couple of days, you might find it taking the whole week. This is Parkinson's Law in action, first observed by Cyril Northcote Parkinson, a British historian, and author. He noted that bureaucratic work tends to increase in complexity and volume to consume the time allotted for it. Essentially, the more time we think we have to do something, the longer it will likely take us to do it, often due to decreased efficiency or added complexity but also due to people’s nature to procrastinate knowing the deadline isn’t yet here.

## Example

**Project Deadlines**

A team given two months to complete a project might use the entire time, while if given only one month, they might complete it just as effectively. Why? The shorter deadline forces more efficient use of time.

## In your professional life

**Personal Deadline Strategy**

Set personal deadlines shorter than official ones to increase your productivity and allow time for refinement. For instance, if a report is due in two weeks, aim to complete it in 10 days. This self-imposed time pressure can boost your focus and efficiency, while the buffer period allows for unexpected delays or last-minute improvements. By consistently beating deadlines, you'll build a reputation for reliability and high-quality work.

## Go deeper in ThinkBetter

The ThinkBetter app has the full Parkinson's Law deep-dive: more examples, a quiz to test yourself, audio narration, and a weekly path that builds these ideas into a habit.

- iOS: https://apps.apple.com/app/id6459831884
- Android: https://play.google.com/store/apps/details?id=io.ventureship.braintricks

### Related concepts

- [Hyperbolic Discounting (Cognitive bias)](https://thinkbetter.app/cognitive-biases/hyperbolic-discounting.md)
- [Law of Diminishing Returns](https://thinkbetter.app/mental-models/law-of-diminishing-returns.md)
- [Pareto Principle](https://thinkbetter.app/mental-models/pareto-principle.md)
- [All cognitive biases](https://thinkbetter.app/cognitive-biases.md)

Page: https://thinkbetter.app/mental-models/parkinsons-law