{"version":"1.0","type":"link","title":"Three mountain problem - Newikis","description":"The Three Mountains Task was a task developed by Jean Piaget, a developmental psychologist from Switzerland. Piaget came up with a theory for developmental psychology based on cognitive development. Cognitive development, according to his theory, took place in four stages. These four stages were…","provider_name":"Newikis","provider_url":"https://newikis.com","cache_age":86400}