The pre-operational stage of child starts when he begins to learn to speak at age two and it lasts up until seven years old. Children start to use mental imagery and language during this stage. Children in this stage are very egocentric, view things that happened around them in only one point of view, and think in a non-logical and nonreversible pattern.
Concrete Operational Stage usually starts at six or seven years old and last till the child is eleven or twelve years old. Children in this stage are capable to take another person's point of view and incorporate more than one perspective simultaneously
Concrete Operational Stage usually starts at six or seven years old and last till the child is eleven or twelve years old. Children in this stage are capable to take another person's point of view and incorporate more than one perspective simultaneously