<P> Alan Baddeley and Graham Hitch proposed a model of working memory in 1974, in an attempt to present a more accurate model of primary memory (often referred to as short - term memory). Working memory splits primary memory into multiple components, rather than considering it to be a single, unified construct . </P> <P> Baddeley & Hitch proposed their three part working memory model as an alternative to the short - term store in Atkinson & Shiffrin's' multi-store' memory model (1968). This model is later expanded upon by Baddeley and other co-workers to add a fourth component, and has become 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 . </P>

Who proposed an influential model of working memory