Observation that an individual
normally can retain or process
only seven give or take two (7±2) items (chunks) of information
in their correct serial-order, in his or her short-term (15 to 30 seconds duration) or 'working' memory
. Reported by the Princeton University's cognitive
psychologist George A. Miller in 1956, it is accepted more as a rule of thumb
than a scientifically proven fact
. Also called Miller's Magic Number.