This book details how to use Intensive Interaction as a psychologically informed practice when working with ‘seldom-heard’ clients. Although Intensive Interaction was originally developed for children with severe and profound learning disability, its use has expanded across age ranges and conditions, and is now utilised with children and adults including autistic individuals and people with dementia. Exploring the context in which Intensive Interaction has and can be used, specifically as a psychological approach, this edited volume covers therapeutic intervention on a one-to-one basis, as well as an intervention within other frameworks such as Trauma Informed Care and Positive Behaviour Support. Case examples are utilised throughout, alongside psychological theory, to demonstrate use in practice. Consideration is also paid to service contexts and how psychologists can introduce this approach in their local areas. The first book on Intensive Interaction written by psychologists for psychological practitioners, this book will appeal to trainee and qualified clinical and counselling psychologists, and psychological practitioners including creative therapists and counsellors.