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| Baddeley & Hitch proposed their working memory model as an
alternative to the short-term store in Atkinson & Shiffrin's
'multi-store' memory model(1968). The model proposed by Baddeley
and Hitch has remained the dominant view in the field of working
memory. However, alternative models are developing (see working
memory) providing a different perspective on the working memory
system. The model of Baddeley & Hitch is composed of three main
components; the 'central executive' (see executive system) which
acts as supervisory system and controls the flow of information
from and to its 'slave-systems': the 'phonological loop' and the
'visuo-spatial sketch-pad'. The slave systems are short-term
storage systems dedicated to a content domain (verbal and visuo-
spatial, respectively). Baddeley & Hitch's argument for the
distinction of two domain-specific slave systems in the model
was derived fro