Rehearsal must play a major part in any complete theory of memory, yet its function is still poorly understood. Waugh and Norman (1965) postulated that rehearsal serves the dual purpose of maintaining items in a short-term store and transferring information about the items to a more permanent long-term store. This view was endorsed, in general, by Atkinson and Shiffrin (1968). They argued that the principal function of rehearsal was to maintain a small set of items in short-term store by repetition, but also that „any information in short-term store is transferred to long-term store to some degree throughout its stay in the short-term store‰ (p. 115).