The rule of 7 +- 2 (also known as Miller's Number) derives from psychology research, which shows that the number of informaiton "chunks" that a person can remember and manipulate at one time varies between five and nine. A larger number of chunks causes information overload. Information chunks can be many things, including names, words in a list, digits, or components of a picture.
( p215, J. Satzinger, R. Jackson, S. Burd, Systems Analysis & Design in a changing world, Thompson )
Tuesday, October 3, 2006
Miller's Number
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