Period means the circle of time. In this case, the period is periodization. This is a way to facilitate understanding of child development, namely by determining the stages of child's age to be educated in accordance with the physical and psychological condition.
The development is a process from childhood to reach maturity and character of progress or perfection of personality. In other words, development is the emergence of new things, for example, children who initially self-centered, it will eventually turn into a social, and if it was once full of fantasy life, in time they would like reality.
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