Rogers has normal limb development and delayed mental development. Upon admission,he was 4 years old. At that time, he could walk alone, felt strange about the new place, and was careful to get to know new people. After a period of time, he learned how things worked and liked to get to know new people and got along with others well. At the age of 5 years, he could go up and down stairs holding the rail, could clap his hands along to the rhythm of music, could pick his favorite toys, and could share toys and food with other kids. At the age of 7 years, he could jump off the ground, could draw 3 parts of the body, and could pick up and throw a ball. At the age of 9 years, his self-management was improved and he knew his gender. He could eat and drink independently, take a bath, and put on his clothes independently. Now he is receiving the special education in the institute. He can imitate drawing pictures, can recognize common colors, can run and jump, and can have simple motion with his friends. He would like to do some work, but his language is delayed and he can only speak some simple words unclearly, He can understand the directions and he is gentle, shy, and likes familiar people close to him. Roger can get along well with other kids, likes playing games, enjoys basketball, and likes riding bikes with kids in the playground. Occasionally he is obstinate, but telling him a story can make him smile.