Three main systems: Central executive and two slave systems for processing verbal (phonological loop) and visual (visuospatial sketchpad); based on weaknesses of MSM, which is too simplistic in its explanation of STM and made by Baddeley and Hitch (1974)
People were confused when asked to listen or look at two things at once, but when asked for only one thing, they were fine as acoustic and visual information are processed separately, preventing overload and improving performance
