This book is a collection of essays on helping people with developmental disabilities communicate successfully. It is intended for practitioners and students in special education, speech-language pathology, and psychology. The essays are as follows: "Communicative Behaviour in the Least Restrictive Environment" (Ken Linfoot); "Play as an Assessment and Intervention Strategy for Children with Language and Intellectual Disabilities" (Nancy Butterfield); "Requesting Behaviours of Preschool Children with Mild Developmental Disabilities" (Diana Messervy); "Selection of Initial Vocabularies for Use in Manual Sign Language Programs" (Kathleen Dice); "Functional Communication and the Role of Context" (Ken Linfoot); "The Use of a Synthetic Speech Output Communication Aid with a Youth Having a Severe Developmental Disability" (Sue Healy); "Communication Instruction in the 1990s: An Overview of Future Directions" (Michael Arthur); and "Enhancing Communication in Functional Settings: Putting Research Into Practice" (Nancy Butterfield, Ken Linfoot, Michael Arthur). (MSE)