You pour water from a short, fat glass into a tall, thin gla…

You pour water from a short, fat glass into a tall, thin glass.  You ask a child if there is more water in the thin glass than there was in the fat glass.  The child says, “No.  The amount of the water has not changed.”  The child has attained at least the _____________ stage of cognitive development.

A parent finds that she has to nag her son more and more to…

A parent finds that she has to nag her son more and more to get him to stop teasing his sister.  The last time it happened, the boy finally stopped his teasing about his mother’s 16th angry request.  The boy’s compliance is best described as the result of