The Metaphysics of Ethics: A Conversation. - Heinz von Foerster; Bernhard Poerksen (Cybern. Hum. Knowing, 2002)

At each and every moment, I can decide who I am Heinz von Foerster on the observer, dialogic life, and a constructivist philosophy of distinctions. - Bernhard Poerksen (Cybern. Hum. Knowing, 2003)

"We Can Never Know What Goes On In Somebody Else's Head": Ernst Von Glasersfeld On Truth And Viability, Language And Knowledge, And The Premises Of Constructivist Education. - Bernhard Poerksen (Cybern. Syst., 2004)

Varieties of Objectivity. - Humberto R. Maturana; Bernhard Poerksen (Cybern. Hum. Knowing, 2004)

The End of Certainty. - Bernhard Poerksen (Cybern. Hum. Knowing, 2008)

Ethics of Enabling Ethics. - Bernhard Poerksen (Cybern. Hum. Knowing, 2011)