The Wechsler Adult Intelligence Scale is the most widely used individually administered intelligence test (IQ test) for adults. It comprises of 11 subtests made up of six verbal subtests and five performance subtests. It yields three IQ (intelligence quotient) scores: Verbal Scale IQ, Performance Scale IQ, and Full Scale IQ. A scale for children ages 5 through 15 years is called WISC -- Wechsler Intelligence Scale for Children and a scale for children ages 4 to 6* years is called WPPSI--Wechsler Preschool and Primary Scale of Intelligence.

Classification of Intelligence according to IQ scores
Classification	IQ Range
Profound mental retardation (MR)	below 20 or 25
Severe MR	20-25 to 35-40
Moderate MR	35-40 to 50-55
Mild MR	50-55 to about 70
Borderline	70-79
Dull normal	80 to 90
Normal	90 to 110
Bright normal	110 to 120
Superior	120 to 130
Very superior	130 and above

Source: Diagnostic and Statistical Manual of Mental Disorders (DSM-IV)