1. Central Executive - Supervisory component which has overall control over the other three slave systems. It plays the most imporant and complex role in working memory as it controls which information is and is not attended to. It also plays a major role in planning and combining information from the three slave systems. The central executive has limitied capacity and can only attend to a limited number of things at one time.
2) Visuo-spatial sketchpad - Function is to hold a limited amount of information coded in a visual form for a short period of time. This sytem helps individuals to navigate and interact with their physical environment. Includes the visual cache, a passive temporary visual store which is linked to an active inner scribe that acts as a rehearsal mechanism.
3) Phonological loop- Function is to store a limited number of speech based sounds for a brief time. It is made up of a phonological store, known as the inner ear which stored acoustically coded items and an articulatory process, known as the inner voice which allows words to be kept in memory by sub vocal repition
4) Episodic buffer - Added in 2000, temporary store responsible for integrating the visual, spatial and verbal information from the other stores and has a limited capacity of about 4 chunks
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