The death of Jean Piaget (Swiss psychologist and biologist) on September 16 marks a significant moment in the history of psychology and educational sciences. Born in 1896 in Switzerland, Piaget devoted much of his life to research on the cognitive development of children. His theory of cognitive development stages profoundly influenced education and child psychology, and continues to be taught in universities and schools worldwide. Throughout his career, Piaget published over 60 books and hundreds of articles. By closely observing children's behavior and thinking, he introduced four main stages of cognitive development: sensorimotor, preoperational, concrete operational, and formal operational. These theories transformed scientific approaches to learning and child education, leading to extensive research in the field. On September 16, 1980, Jean Piaget died in Geneva at the age of 84. His works and theories remain influential among researchers and educators, playing a key role in shaping modern psychology. Commemorating this date provides an opportunity to reflect on his scientific achievements and the broad impact he had on contemporary education and psychology. This observance was added to some calendars in 1980 to recognize Piaget's global significance and lasting influence on the human sciences, serving as a reminder of his transformative role in education and psychology.
