The notion “radical constructivism” (RC) was coined by Ernst von Glasersfeld in 1974 in order to emphasize that from an epistemological perspective any constructivism has to be complete (or “radical”) in order not to relapse into some kind of fancy realism. The basic tenet of RC is that any kind of knowledge is constructed rather than perceived through senses. As such, RC does not present a metaphysics in the strict sense as it does not make statements about an outside reality (“No statement” means neither confirming nor denying reality. The subject of much criticism, RC equals solipsism, doesn’t therefore apply). Now, the idea itself does not originate in EvG. Forerunners of the RC movement in the 18th century were Giambatista Vico, whose dictum “verum ipsum factum” already pointed in the direction of knowledge construction, and George Berkeley whose claim “esse est percipi” challenged metaphysics. (excerpted from http://www.univie.ac.at/constructivism/about.html)
Video circa 2003 by Judy Lombardi.
Radical Constructivism Links