an active system that receives, stores, organizes, alters and recovers information
changing incoming information into a usable form
being held in the system
encoded and stored as images or phonetically; briefly stores small amounts of information; combined with other mental processes; provides the "scratch-pad" working memory; still limited; has a capacity of 7 ± 2 information bits
permanent and apparently limitless; the more you know, the easier it becomes to add new information; typically stored on the basis of meaning; linking new information to information already in place increases the meaning.
widely believed that memory is relatively permanent