<P> Conservation refers to a logical thinking ability which , according to the psychologist Jean Piaget , is not present in children during the preoperational stage of their development at ages 2 -- 7 , but develops in the concrete operational stage at ages 7 -- 11 . Conservation refers to the ability to determine that a certain quantity will remain the same despite adjustment of the container , shape , or apparent size . </P>
<P> Conservation refers to a logical thinking ability which , according to the psychologist Jean Piaget , is not present in children during the preoperational stage of their development at ages 2 -- 7 , but develops in the concrete operational stage at ages 7 -- 11 . Conservation refers to the ability to determine that a certain quantity will remain the same despite adjustment of the container , shape , or apparent size . </P>
in which stage of cognitive development does the conservation concept first appear
in which stage of cognitive development does the conservation concept first appear
concrete operational stage
concrete operational stage