Martin Vögeli schrieb / wrote: Article: The Magical Number Seven: Warum Navigationen nur sieben Punkte und Lernobjekte sieben Informationen umfassen sollen. Ein Artikel von George A. Miller aus dem Jahr 1956: "And finally, what about the magical number seven? What about the seven wonders of the world, the seven seas, the seven deadly sins, the seven daughters of Atlas in the Pleiades, the seven ages of man, the seven levels of hell, the seven primary colors, the seven notes of the musical scale, and the seven days of the week? What about the seven-point rating scale, the seven categories for absolute judgment, the seven objects in the span of attention, and the seven digits in the span of immediate memory?" http://scholar.google.at/scholar?q=the+magical+number+seven

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