The Picture Exchange Communication System (PECS) is a communication program that allows children and adults suffering from autism or other communication disorders without effective or socially acceptable speech abilities to learn how to communicate. Some with limited speaking abilities or no ability to speak whatsoever may, sometimes possess more communicative skills than others who exhibit better speaking abilities but do not know how to use them.

The PECS system trains children to approach and show the picture of the desired object to the person they wish to communicate with and trade the desired object. They start learning the communication process using only one picture and in time, they learn how to combine pictures in order to learn more complicated grammatical structures, semantic relationships and communication functions.

The PECS system is developed according to the typical development of the language in the sense that the primary aim is to teach children how to communicate and the basic principles of communication in order for them to learn to communicate according to specific messages.

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