A few years ago, I attended a commissioning workshop where the consultant asked us to divide a set of concepts into “truths” and “non truths”. I immediately challenged her: two things can be true at the same time; complexity doesn’t divide neatly. No, she replied there is only one truth and looked at me with a sense of alarm and puzzlement. She was clearly not a social worker, educationalist, therapist nor indeed a systems-minded commissioner.