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It extends on the work of the MSM and explains the complexity of STM with the tasks it can perform Research on dual tasks (Baddeley 1973) supports the idea of separate components and how they can be overloaded
The WMM is vague on the link between STM and LTM It is difficult to measure the CE which means that not much is actually known about it (although this may well change as more research is conducted on it)