Piaget and His School
                                            
                                        
                                                                                                Inhelder in her introduction. The reason for this unity is that explanatory adequacy can be attained only by exploring the formative and constructive aspects of development. To explain a psychologic reaction or a cognitive mechanism (at all levels
                                                Inhelder in her introduction. The reason for this unity is that explanatory adequacy can be attained only by exploring the formative and constructive aspects of development. To explain a psychologic reaction or a cognitive mechanism (at all levels
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