जीन पियाजे के अनुसार, व्यवहारों और विचारों को जोड़ना, व्यवस्थित करना, पुनर्गठित करना और सुसंगत प्रणालियों में पुनर्व्यवस्थित करना क्या कहलाता है?

In Piaget's theory, what process describes an infant's action when she changes the way she holds her hand as she reaches for round objects as opposed to square ones?

The ability to form and use symbols is a major accomplishment of which stage of Piaget's cognitive development?