The philosophical idea that knowledge and meaning are constructed by actions on objects, which are neither innate nor simply transmitted through experience. Constructivists believe that events have no meaning by themselves, but instead that individuals must create meaning through the application of existing actions or ways of knowing. It is the epistemological theory that underlies Piaget‘s approach to cognitive development. Radical constructivism holds that all kinds of experience are in essence subjective and that no two individuals share the same experience, language being a case in point.
See Cognitive development, Bridging, Developmental epistemology, Experience, Experience-dependent processes, Foundational knowledge, Nativism, Solipsism