The book presents a system of correctional pedagogical work on the formation of the mental activity of children with disabilities in mental development. A detailed description is given of more than 200 didactic games, exercises, stories, tasks and riddles that help to enhance the cognitive activity of preschool children. At the end of the manual there are two appendices with material for teachers, in order to understand the creation of a situation for classes with children, and visual handouts for children. Addressed to teachers-defectologists, psychologists, college and university teachers, students of seminars and advanced training courses, students of pedagogical universities, parents raising preschool children with developmental disabilities.