• Development in specific content d

• Development in specific content domains can sometimes be characterized as a series of stages. Although neo-Piagetian theorists reject Piaget’s notion that a single series of stages characterizes all of cognitive development, they speculate that cognitive developments in specific content domains often has a stagelike nature.(e.g., Case; 1985; Case & Okamoto, 1996; Fischer & Bidell stage is marked by the acquisition of new abilities, which children practice and gradually master over time, Eventually, they integrate these abilities into more complex structures that mark their entry into a subsequent stage. Thus, as is true in Piaget’s theory. Eacj stage cpmstrictove;u builds on the abilities a acquired in any preceding stages.