Reducing Reliance on Superstition
http://www.humanfactors.com/downloads/sep002.htm

Bailey, Robert
Human Factors International
2000

Abstract:

Probably the most well-known article in the fields of usability, user interface design and user experience is Miller’s 1956 paper entitled 'The magical number seven, plus or minus two.' It is incredible how this article has lasted for over 40 years, and still seems to influence many design decisions. More recent, better research is available, but not being used.