The ability to understand that objects retain their properties even when their appearance changes (conservation) and the capacity to focus on multiple aspects of a situation simultaneously are key features of cognitive development.
Decentration refers to the ability to pay attention to multiple aspects of a situation at once. For example, understanding that a tall, thin glass holds the same amount of water as a short, wide glass.
Reversible thought processes allow an individual to mentally undo an action or sequence of events. For instance, understanding that if 3 + 2 = 5, then 5 - 2 = 3.
These characteristics, decentration and reversibility, are defining features of the Concrete Operational Stage, typically observed in children aged 7 to 11 years. During this stage, children begin to think logically about concrete events and objects.
Therefore, decentration and reversible thought processes are characteristic of the Concrete Operational Stage.