Is seven really the limit?

It varies; modern research suggests about four chunks.

How is it used in UX?

To chunk information and avoid making users recall content from other screens.

Miller's Law

🧠 Psychology By CampusDown Wiki Editorial Team Last updated October 27, 2026

Miller's law is psychologist George Miller's (1956) observation that people can hold about seven plus or minus two items in short-term memory at once, highlighting the value of chunking information.

Contents

1. The magical number seven
2. Reducing memory load with chunking
3. Myth: seven menu items
4. FAQ
5. References

The magical number seven

Miller (1956) noted that immediate memory for digits, tones and words clusters around seven items, and stressed chunking to overcome the limit. Cowan (2001) revised capacity to about four chunks when rehearsal is blocked, and Baddeley's (2003) working memory model shows limits vary by information type.

Reducing memory load with chunking

Chunking (Gobet et al., 2001) applies directly: format phone and card numbers in groups and split six-digit codes into threes. Show needed information on the same screen rather than making users recall it, easing the extraneous load of Sweller's (1988) cognitive load theory.

The law concerns recall. Visible menus need no memorising, so it gives weak grounds to cap them (Lidwell et al., 2010; Yablonski, 2020). Judge menu count by Hick's law, space and frequency; use Miller's law as 'do not make users remember what they cannot see'.

FAQ

Is seven really the limit?: It varies; modern research suggests about four chunks.
How is it used in UX?: To chunk information and avoid making users recall content from other screens.

Sources reviewed: 2026-10-27

References

Miller, G. A. (1956). The magical number seven, plus or minus two: Some limits on our capacity for processing information. Psychological Review, 63(2), 81–97. The original 'seven plus or minus two' paper.
Cowan, N. (2001). The magical number 4 in short-term memory: A reconsideration of mental storage capacity. Behavioral and Brain Sciences, 24(1), 87–114. Revises capacity to about four chunks.
Baddeley, A. (2003). Working memory: Looking back and looking forward. Nature Reviews Neuroscience, 4(10), 829–839. Review of the working memory model.
Gobet, F., Lane, P. C. R., Croker, S., Cheng, P. C.-H., Jones, G., Oliver, I., & Pine, J. M. (2001). Chunking mechanisms in human learning. Trends in Cognitive Sciences, 5(6), 236–243. Explains chunking, behind grouping digits.
Sweller, J. (1988). Cognitive load during problem solving: Effects on learning. Cognitive Science, 12(2), 257–285. Origin of cognitive load theory.
Yablonski, J. (2020). Laws of UX: Using psychology to design better products & services. O'Reilly Media. Practical UX framing of Miller's law.
Lidwell, W., Holden, K., & Butler, J. (2010). Universal principles of design (2nd ed.). Rockport. Warns against misusing 7±2 as a menu limit.

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This article was last updated on October 27, 2026. It is based on widely recognized original works and textbooks; when citing it in a paper, please check the original sources listed in the references.