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Pre-operational
(2-7 years)

Learns to use language and to represent objects by images and words 
Thinking is still egocentric: has difficulty taking the viewpoint of others 
Classifies objectsby a single feature: e.g. groups together all the red blocks regardless of shape or all the square blocks regardless of colour 

Preoperational stage

The preoperative stage is the second of fourstages of cognitive development.[5] By observing sequences of play, Piaget was able to demonstrate that towards the end of the second year, a qualitatively new kind of psychological functioningoccurs.
(Pre)Operatory Thought is any procedure for mentally acting on objects. The hallmark of the preoperational stage is sparse and logically inadequate mental operations. During this stage, the childlearns to use and to represent objects by images, words, and drawings.[5] The child is able to form stable concepts as well as mental reasoning and magical beliefs.[5] The child however is still notable to perform operations; tasks that the child can do mentally rather than physically.[5] Thinking is still egocentric: The child has difficulty taking the viewpoint of others. Two substages can beformed from preoperative thought.[5]
The Symbolic Function Substage
Occurs between about the ages of 2 and 7.[5] The child is able to formulate designs of objects that are not present.[5]Other examples of mental abilities are language and pretend play.[5] Although there is an advancement in progress, there are still limitations such as egocentrism and animism.[5] Egocentrism occurs whena child is unable to distinguish between their own perspective and that of another person's.[5] Children tend to pick their own view of what they see rather than the actual view shown to others.[5] Anexample is an experiment performed by Piaget and Barbel Inhelder.[5] Three views of a mountain are shown and the child is asked what a traveling doll would see at the various angles; the child...