Severe refers to something that is of great concern or intense botheration. The word is often used to refers to condition of a disorder where a person might experience quite a serious impairment in their physical or psychological health functioning. The word have been used by DSM to define the seriousness of an disorder, for example while talking about intellectual disability, the patients are differentiated in four degrees of severity as per the manual, for aid in the treatment procedure. They are Mild, Moderate, Severe and Profound. Severe intellectual disability represents around 4 percent of individuals -with intellectual disability. These people might be able to develop communication skills in childhood and often can learn to count as well as recognize words which are critical to functioning. In adulthood, they may adapt well to supervised living situations, like group homes, and perform work-related tasks in supervision. IQ ranges from 20 to 35.