Stage Model of MemoryThere are 3 stages of memory in the stage model of memory. The first is the sensory memory stage, the second is the short-term memory stage, and the last is the long-term memory stage.

Sensory memory is the first stage. This is where all the first senses are stored. Everything that you hear or sense is stored here. Even though you don't think that you hear everything going on around you, your brain still processes it. All of the information is stored in this from .25 to 3 seconds. Then the brain decides if it wants to store it into short-term memory.

Short-term memory is the second stage of the model. This stage is also considered your working memory. This is where information from the sensory or long-term memory goes to. It processes information from the sensory memory and retrieves memory from your long term memory in order to do work or recite old information. Information that is stored here is only here for about 30 seconds before it is "deleted."

Long-term memory is the 3rd and final stage of the model. This is where all the encoded information from the working memory is stored for long periods of time. There are 3 types of long term memory as well. Those types are semantic, procedural, and episodic. Semantic memories are just information that is learned in school for example. Procedural is all the information that you do everyday like eating or going to school. Episodic is all of the information that has gone on through out your life such as stuff that happened to you last year sometime.

References:
(2001). Memory. Retrieved December 18, 2008, from : http://environmentalet.org/psy111/memory.htm