Whenever undiscussables exist, their existence is also undiscussable. Moreover, both are covered up, because rules that make important issues undiscussables violate espoused norms... It is very difficult to manage [organizational defense routines]. They continue to exist and proliferate because they are relegated to the realm of underground management and all sides tacitly agree to this state of affairs. As a result, organizational defense routines often are very powerful
p. 438 as cited in: Leni Wildflower, Diane Brennan (2011) The Handbook of Knowledge-Based Coaching. p. 159 - On organizational learning (1999)