1. Sensorimotor Stage
Age: Birth-2 years
This stage is marked by the baby's ability to understand the world in terms of what he can do with an object. Example: A ball is only how it looks to the eye, tastes, and feels to the touch.
2. Preoperational Stage:
Age: 2-6 years
In this stage, the child is starts to use images, words and actions that stand for something else. Fastasy, or pretend play also starts to appear in this stage as well.
3. Concrete Operational Stage
Age: 6-12 years
Logic is developed, such as addition, subtraction, multiplication, division, and class inclusion; also inductive and deductive reasoning are developed.
and 4. Formal Operational
Age: 12 years +
The child is able to manipulate events in his head: see things that he never has seen or that have yet to happen and classify and organize ideas.
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