Intelligence has been defined as a global capacity or a composite of several intellectual skills. According to Wechsler, intelligence is “the aggregate or global capacity of the individual to act purposefully, to think rationally, and to deal effectively with his environment”. Developmental Quotient (DQ), Intelligence Quotient (IQ), Performance quotient (PQ) and assessment of adaptive functioning in terms of Social Quotient (SQ) are widely used concepts in intelligence.
Stanford -Binet test for Intelligence: