Jean William Fritz Piaget (UK: /piˈæʒeɪ/, US: /ˌpiːəˈʒeɪ, pjɑːˈʒeɪ/, French: [ʒɑ̃ pjaʒɛ]; 9 August 1896 – 16 September 1980) was a Swiss psychologist known …; Piaget (1936) was one of the first psychologists to make a systematic study of cognitive development. His contributions include a stage theory of child …. Piaget relojes de la reproducción de la alta calidad tradicional 4650, Rich with more than 140 years of history, Piaget has created a unique signature by offering ultra-thin watches alongside a fine jewellery collection., . Jean Piaget – Wikipedia? Since 1874, Piaget has been crafting luxury watches and luxury jewellery treasures by blending a jeweller's refinement with its watchmaking sophistication.; Piaget? Piaget – Twitter; Jean Piaget's Theory and Stages of Cognitive Development, Piaget is a truly distinctive watch and jewellery Maison, with a unique expertise in gold and jewellery crafting and ultra-thin watch movements.? Jewellery – Official Piaget Website – Watches. Piaget – Home | Facebook!