Selectively mute children are at a significant disadvantage personally, socially and educationally. This unique manual emphasises practical assessment and treatment and provides advice and information, filling a significant gap in the availability of suitable resources in this field.•Uses an approach based on behavioural principles and a hierarchy of stages of confident speaking originally conceived by Anthony Glassberg.•Summarises relevant literature and theory and provides detailed ideas on assessment and management.•Includes case examples, photocopiable material, and a discussion about progress, transfer and discharge.•Written for teachers, clinical and educational psychologists, speech language therapists, child psychiatrists and parents.Chapters:•Frequently asked questions•General assessment considerations and implications•Preliminary investigation•Child interview and assessment•Creating the right environment: advice for home and school•General treatment considerations•Overview of the treatment progression•A structured treatment programme•Eliciting speech for the first time/Generalising speech across people and settings/Effective practice•Parent and teacher support•Letting go•Illustrations of intervention.