Evaluate the working memory model.
+ Patient KF: case study shows that the phonological loop and visual spatial sketchpad are separate stores, as he suffered selective damage
+ Baddeley's dual task experiment: performance is good when doing one language and one visual based task, but drops dramatically if both tasks are language/visual based, suggests that there are 2 different subsystems
+ RWA: listening to music while driving does not impact performance, but going on your phone while driving does
-none of the systems can be observed directly, so low scientific status