The working memory model differs from the simple short-term store because it holds that short-term memory:

1. The stage model treats each stage as a single undivided store. 2. Later work questioned that for the middle stage. 3. Baddeley and Hitch in 1974 proposed a working memory model in which short-term memory has different forms. 4. Those forms handle different kinds of material rather than competing for one slot. 5. The model keeps short-term memory brief; it is the internal structure that changes. _Source: OpenStax Psychology 2e (CC BY 4.0), Ch 8 'Memory', sections 8.1-8.4_