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Information processing theory is an approach used to study cognitive development evolved out of the American experimental tradition in psychology. Developmental psychologists who adopt the information-processing perspective account for mental development in terms of maturational changes in basic components of a child’s mind. The theory is based on the idea that humans process the information they receive, rather than merely responding to stimuli. This perspective equates the mind to a computer, which is responsible for analyzing information from the environment. According to the standard information-processing model for mental development, the mind’s machinery includes attention mechanisms for bringing information in, working memory for actively manipulating information, and long term memory for passively holding information so that it can be used in the future. A primary focus of information processing is on memory. The most widely accepted model is called ‘Stage Theory’ based on the work by Atkinson and Shriffin shown in figure 1. The model focuses on how information is stored in the memory in three stages. In this theory, information is thought to be processed in a serial, discontinuous manner as it moves from one stage to another.