première

The Preoperational Stage is divided into two substages: I. Symbolic Function Substage From two to four years of age children find themselves using symbols to represent physical models of the world around them. This is demonstrated through a child's drawing of their family in which people are not drawn to scale or accurate physical traits are given. The child knows they are not accurate but it does not seem to be an issue to them. II. Intuitive Thought Substage At between about the ages of four and seven, children tend to become very curious and ask many questions, beginning the use of primitive reasoning. There is an emergence in the interest of reasoning and wanting to know why things are the way they are. Piaget called it the "intuitive substage" because children realize they have a vast amount of knowledge, but they are unaware of how they acquired it. Centration, conservation, irreversibility, class inclusion, and transitive inference are all characteristics of preoperative thought.[62] 3. Concrete operational stage: from ages seven to eleven. Children can now converse and think logically (they understand reversibility) but are limited to what they can physically manipulate. They are no longer egocentric. During this stage, children become more aware of logic and conservation, topics previously foreign to them. Children also improve drastically with their classification skills. 4. Formal operational stage: from age eleven to sixteen and onwards (development of abstract reasoning). Children develop abstract thought and can easily conserve and think logically in their mind. Abstract thought is newly present during this stage of development. Children are now able to think abstractly and use metacognition. Along with this, the children in the formal operational stage display more skills oriented towards problem solving, often in multiple steps.

"the great pioneer of the constructivist theory of knowing"

They then spent a couple of pages on the history of elementary education, followed by a discussion of the stages of instruction, beginning with "reading readiness" and continuing through "sight words" and "context clues", to mature skills that allow the reader to compare the views of different writers.

We would nowadays probablycall the second group ‘constructivist’ or ‘cognitive’ or ‘sociocultural’psychologists, though the committee did not venture to name them as such. Thislatter school (or schools) they took to be associated with psychologists such asthe British Susan Isaacs, the Russian Alexander Luria, the American JeromeBruner, and the Swiss Jean Piaget.

Prof. Joseph Novak (Cornell) developed conceptual maps based on David Ausubel's subsumption (aka meaningful learning) theory and Piaget's concept of conceptual schemes. Conceptual maps have been proven successful across all levels of education worldwide (check Google Scholar).

„Es gibt keine primitive Intuition der Gleichzeitigkeit.“

The move toward social constructivist pedagogical models, initiated by researchers such as Piaget and Vygotsky, makes the wiki a potentially useful educational tool. The wiki can provide the medium by which learners communicate and negotiate in their efforts to reach a shared understanding of a problem (Bruns, 2005).

this contradicts Piaget's view of universal stages and content of development.

Jean Piaget, John Dewey, Maria Montessori, or Paulo Friere

(Actually, I’m pretty sure the company above meant “constructivism” here, since “constructionism” builds upon the learn-by-doing of constructivism by stressing the importance of the tangible not just the abstract.)