An IQ of 80-120 is considered normal. General intelligence, or IQ, is typically assessed through one or more standardized tests. Common IQ tests used for children include the Wechsler Intelligence Scale for Children, Stanford-Binet, and Kauffman Assessment Battery for Children.

An IQ of 50-55 to 70 is considered mild mental retardation, or what schools often term as "educable." Children with mild retardation tend to grow up to live successfully but may need mild support, guidance, or supervision.

An IQ of 35-40 to 50-55 is considered moderate retardation. Schools often call individuals with moderate retardation "trainable." Children with moderate retardation tend to grow up needing moderate supervision and assistance. They typically do not progress beyond a second-grade level in school, may have difficulty with communication and socializing, and can benefit greatly from vocational training.

An IQ of 20-25 to 35-40 is considered severe mental retardation. Children with severe mental retardation typically do not develop language or have very poor language skills. They can be trained in self-help skills and survival skills and be taught to perform simple tasks under supervision.

An IQ below 20-25 is considered to be profound mental retardation and most children diagnosed with this tend to also have neurological conditions that account for the mental retardation. These children will grow up to need a structured environment with constant care.