Perhaps you've attended some high brow conference that produces 10 bullet points on "How to Change Education"- and not much happens. Maybe you work an at institution that restricts you from using a certain technology or forces you to use another. And while the image of a revolutionary edupunk is charming, most of us are not ready to burn down our organizations- we believe in their purpose. Despair not! There is something out there- an approach of creatively side stepping what limits us, to exploiting what we are forced to use in new ways, to sneak innovations in the back window that don't rock the house.
Constructivist theories grew out of the work of a couple of Russians around the time of the Russian Revolution. It is radical subjectivism dressed up as science, and has no scientific credibility whatsoever. It is used by radical educators to push their barrow that nothing the teacher knows is worth the student learning and that all knowledge is innate. It's bullsh*t. Theories like this rot are part of the reason that the bottom has dropped out of Western education and we have a generation who can't write. This should be resisted by any educator with an interest in educational excellence.