A long-awaited book from developmental disorders expert John Morton, Understanding Developmental Disorders: A Causal Modelling Approach makes sense of the many competing theories about what can go wrong with early brain development, causing a child to develop outside the normal range. It is based on the idea that understanding developmental disorders requires us to talk about biological, cognitive, behavioral and environmental factors, and to talk about causal relationships among these elements. It explains what causal modelling is and how to do it. It compares different theories about particular developmental disorders using causal modelling. It will have a profound impact on research in the fields of psychology, neuroscience and medicine.