*In Piaget's concrete operational stage the child is able to conserve due to the development of reversibility and decentration. Other achievements of this stage are: A Deferred imitation B Object permanence C Propositional thought D Transitivity {Ans: The Correct Answer is "D" Other achievements of the concrete operational stage are transitivity, or the ability to mentally sort objects; and hierarchical classification--the ability to sort object into classes and subclasses based on similarities and differences among groups. Deferred imitation and object permanence are achievements of the sensorimotor stage. Deferred imitation is the ability to imitate an observed act at a later point in time. Object permanence is the understanding that objects continue to exist even when they are not there. Finally, propositional thought (C) is developed in the Formal Operational Stage. It is the ability to evaluate the logical validity of verbal assertions without having to use real-world circumstances.}A scale of measurement that is used for rank ordering of observations. Example: Classification of freshman, sophomore, junior, senior.a)interval b)ordinal c)ratio d) nominal e) ratio {Ans: b}no matter where one enters the system, the same end result occurs for the family. it is the patterns of behavior that are crucial to