Hi Geisha - For me, what distinguishes a living educational theory from other forms of theory is that it is an individual's explanation of his or her educational influence in their own learning, in the learning of others and in the learning of the social formations in which the individual is living and working. I've found an action research approach the most appropriate for generating living theories in enquiries of the kind, 'How do I improve what I am doing?' It sounds to me that your colleague is using action reflection cycles as he works to improve his practice. To generate and to help to strengthen the validity of his living educational theory he could offer an evidence-based explanation of his educational influence to a forum such as this.