Mental retardation (MR) is a developmental disability categorized by considerably impaired intellectual and adaptive functioning. It's outlined by associate degree IQ score underneath 70 additionally to deficits in two or additional adaptive behaviors that have an effect on daily life. Once targeted almost entirely on psychological feature, the definition currently includes each a part regarding mental functioning and one regarding individuals' useful skills in their environments. As a result of this concentrate on the person's talents in observe, someone with a bizarrely low IQ may not be thought-about to own intellectually incapacity or disability. The milder the mental retardation, the harder it generally is to spot a particular etiology.