This essay addresses the working memory model proposed by Baddeley and Hitch (1974 in Smith & Kosslyn, 2007) as a response to Atkinson and Shiffrins (1968 in Smith, 2007) multi-store model. According to Baddely and Hitch the multi-store model failed to explain most of the complexities of human memory and considered it too simplistic. They argued that short-term memory should have multiple components rather than being a single inflexible store, as previously suggested by Atkinson and Shiffrin (1968). The working memory model is therefore an improvement on the multi-store model. According to Baddeley and Hitch, working memory is a limited-capacity system that stores and processes information. According to Baddeley and Hitch (1974) what constitutes working memory can be divided into four distinct components that contribute to memory processes. They are the phonological circuit, the visual spatial sketchbook, the episodic buffer and the central executive (in Passer, Smith, Holt, Bremner, Vliek, 2009). The main role of the phonological circuit is to store mental representations of auditory information (in Passatore, 2009). It has a limited capacity and stores information in vocal form. It is further divided into two other components; the articulatory rehearsal system which has a limited capacity of 2 seconds and repeats information verbally and is linked to speech production and phonological memory which temporarily retains speech-based information (in Smith, 2007). Evidence for the existence of the phonological loop comes from Baddeley (1966 in Passer, 2009) They examined the effect of word length by presenting participants with visual presentations of lists of words and asking them to write t... in the center of the paper. ..however issues such as reliability, validity and bias arise when studying brain-damaged patients, so it is not always a valid way of studying working memory (in Smith, 2007). In conclusion, Baddeley and Hitch (1974) developed working memory in response to the multi-store model and introduced four mechanisms involved; the phonological circuit, the visuospatial sketchbook, the episodic buffer and the central executive. The four components are also widely supported by a good deal of evidence (in Smith, 2007). References Parkin, A. J., (1993). Memory phenomena, experiment and theory. Blackwell. USA.Passer, M., Smith, R., Holt, N., Bremner, A., Sutherland, E., & Vliek, M. (2009). Psychology; Science of mind and behavior. (European edition). New York.Smith, E.E., & Kosslyn, S.M. (2007). Cognitive psychology, mind and brain. Massachusetts, USA: Pearson