Find the curvature of the curve 
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Definitions:
Piaget
Jean Piaget, a Swiss psychologist known for his pioneering work in child development, especially regarding cognitive development stages.
Sequential Design
A research method that combines cross-sectional and longitudinal designs to observe different cohorts over time.
Longitudinal Designs
Research approaches that study participants over a period of time to observe changes or developments in behavior, skills, or attitudes.
Cross-sectional
A research strategy in observational studies where information is gathered from a whole population or a representative portion, analyzed at one specific time.
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