It's a structural model outlining the three memory stores, being the sensory register, short-term, long-term memory as individual unitary stores.
Information passes through the multistore model of memory in a linear fashion. Each of these stores has its own characteristics in terms of coding, capacity and duration.
In order for information to pass from the sensory memory to the short-term memory, attention is needed.
In order for information to pass from the short-term memory to the long-term memory, rehearsal is needed.
The information must be retrieved back from the long-term memory to the short-term memory for it to be accessed due to it being a linear model.
The sensory register is not under cognitive control like the short-term memory or the long-term memory. Instead it comes from the senses detected and recordedautomatically.
All the information found in the short-term and long-term memory were initially gathered by the sensory register.
The coding of the sensory register is modality specific, meaning that each sense organ codes differently.
If information is not passed through the long-term or short-term memory it may be lost via displacement or decay.
No limit has ever been found for the capacity or duration of long-term memory. Even those who lose information may not have lost it but may have lost access even though it is still in the LTM