Constructivism (philosophy of education) partially coincident with constructionism
Background
Constructivism in education has roots in epistemology, which - in philosophy - is a theory of knowledge, which is concerned with the logical categories of knowledge and its justificational basis. Epistemology also focuses on both the warranting of the subjective knowledge of a single knower and conventional knowledge. In constructivism, hence, it is recognized that the learner has prior knowledge and experiences, which are often determined by their social and cultural environment. Learning is therefore done by students' "constructing" knowledge out of their experiences. While the Behaviorist school of learning may help understand what students are doing, educators also need to know what students are thinking, and how to enrich what students are thinking. There are scholars who state that the constructivist view emerged as a reaction to the so-called "transmission model of education", including the realist philosophy that it is based on.Constructivism can be traced back to educational psychology in the work of Jean Piaget (1896–1980) identified with Piaget's theory of cognitive development. Piaget focused on how humans make meaning in relation to the interaction between their experiences and their ideas. His views tended to focus on human development in relation to what is occurring with an individual as distinct from development influenced by other persons. Lev Vygotsky's (1896-1934) theory of social constructivism emphasized the importance of sociocultural learning; how interactions with adults, more capable peers, and cognitive tools are internalized by learners to form mental constructs through the zone of proximal development. 
Expanding upon Vygotsky's theory Jerome Bruner and other educational psychologists developed the important concept of instructional scaffolding, whereby the social or informational environment offers supports (or scaffolds) for learning that are gradually withdrawn as they become internalized.Views more focused on human development in the context of the social world include the sociocultural or socio-historical perspective of Lev Vygotsky and the situated cognition perspectives of Mikhail Bakhtin, Jean Lave and Etienne Wenger; Brown, Collins and Duguid; Newman, Griffin and Cole, and Barbara Rogoff.The concept of constructivism has influenced a number of disciplines, including psychology, sociology, education and the history of science. During its infancy, constructivism examined the interaction between human experiences and their reflexes or behavior-patterns. Piaget called these systems of knowledge "schemes."
Schemes are not to be confused with schemata (schemas), a term that comes from schema theory, which is from information-processing perspectives on human cognition. Whereas Piaget's schemes are content-free, schemata (the plural of schema) are concepts; for example, most humans have a schema for "grandmother", "egg", or "magnet."
Constructivism does not refer to a specific pedagogy, although it is often confused with constructionism, an educational theory developed by Seymour Papert, inspired by constructivist and experiential learning ideas of Piaget.
Piaget's theory of constructivist learning has had wide-ranging impact on learning theories and teaching methods in education, and is an underlying theme of education reform movements.History
Earlier educational philosophies did not place much value on what would become constructivist ideas; children's play and exploration were seen as aimless and of little importance.  Jean Piaget did not agree with these traditional views; he saw play as an important and necessary part of the student's cognitive development and provided scientific evidence for his views. Today, constructivist theories are influential throughout the formal and informal learning sectors. In museum education, constructivist theories inform exhibit design. One good example of constructivist learning in a non-formal setting is the Investigate Centre at The Natural History Museum, London. Here visitors are encouraged to explore a collection of real natural history specimens, to practice some scientific skills and make discoveries for themselves. Writers who influenced constructivism include:
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