When patient meets doctor, as well as engaging in a transaction with a clinical purpose, they react to one another as people. Their personalities and ability to make relationships in general also affect the professional interaction. As with other relationships, things can go wrong. The outcome of a consultation may not then be what was hoped for or intended on either side. What may be lost, or not even achieved, is a sense of working with one another - hence the 'problem patient' or 'quack doctor'. This book describes the factors that may complicate the clinical transaction between patient and doctor, emphasising and explaining the influence of often unconscious personal aspects. This is encompassed within a readily applied and concise model, which yields a fresh analysis and understanding. The insight gained can help doctors, within their own consultational styles, to better manage their interaction with patients. Plentiful clinical case vignettes illustrate this approach to understanding and managing clinical transactions and will be welcomed by clinical students and doctors in training, as well as by their trainers.