The Myth of 'Seven, Plus or Minus 2'
http://www.ddj.com/documents/s=4058/nam1012431804/

Kalbach, James
Dr. Dobb's
2002

Abstract:

This article proposes that the optimal number of menu items cannot be reduced to the generalized 'Magic Seven, Plus or Minus Two' (7±2). The author proposes that instead, when planning a site information architecture, the two most important considerations are breadth versus depth and the display of information.