"The magical number seven, plus or minus two: some limits on our capacity for processing information" was a paper published originally in "The Psychology Review". This paper remains Miller's most famous and cited piece of work in the history of psychology. It outlines the number of items, numbers, or objects an average human memory can hold. Miller states in his paper, "This number assumes a variety of disguises, being sometimes a little larger and sometimes a little smaller than usual, but never changing so much as to be unrecognizable" (Miller 1956). He did a series of memory tasks that led him to believe that 7 was the number. The paper goes into depth stating how the memory span is a complicated source and how it can hold a lot of information.