Camille Sweeney and Josh Gosfield writing in The New York Times:
During the 1970s, Chris Argyris, a business theorist at Harvard Business School (and now, at 89, a professor emeritus) began to research what happens to organizations and people…when they find obstacles in their paths. Professor Argyris called the most common response single loop learning — an insular mental process in which we consider possible external or technical reasons for obstacles.
Less common but vastly more effective is the cognitive approach that Professor Argyris called double-loop learning. In this mode we question every aspect of our approach, including our methodology, biases and deeply held assumptions. This more psychologically nuanced self-examination requires that we honestly challenge our beliefs and summon the courage to act on that information, which may lead to fresh ways of thinking about our lives and our goals.