Piaget Developmental Model. Jean piaget was a swiss developmental psychologist who studied children in the early 20th century. The theory deals with the nature of knowledge itself and how humans gradually come to acquire construct and use it.
Piaget developed his theories by watching children and making notes about their progress. In the 1920s piaget observed children reasoning and understanding differently depending on their age. Toddlerhood 18 24 months through early childhood age 7.
He disagreed with the idea that intelligence was a fixed trait and regarded cognitive development as a process which occurs due to biological maturation and interaction with the environment.
Piagetian theory and concepts via a mass of publcations and empirical data transformed the developmental psychology field of the early twentieth century behaviourist leanings. Piaget developed his theories by watching children and making notes about their progress. ˌ p iː ə ˈ ʒ eɪ p j ɑː ˈ ʒ eɪ french. Piaget s theory of cognitive development is a comprehensive theory about the nature and development of human intelligence it was originated by the swiss developmental psychologist jean piaget 1896 1980.