The Atkinson–Shiffrin model is a model of memory proposed in 1968 by Richard Atkinson and Richard Shiffrin. The model asserts that human memory has three separate components:a sensory register, where sensory information enters memory, a short-term store, also called working memory or short-term memory, which receives and holds input from both the sensory register and the long-term store, and a long-term store, where information which has been rehearsed in the short-term store is held indefinitely.