made observations, for example there are 7 days in a week and 7 notes on the musical scale, therefore he said that the span of the STM is about 7 items +/- 2
Miller noted people can recall 5 words as well as they can do 5 letters (do this by chunking- grouping units or clumps)
LACKS VALIDITY- conducted in 1956- temporal,
Research that lacked vigorous control
Some pps may have been distracted while tested and so maybe did not perform as well as others did
However the results of the study have been supported, supporting it's validity
