For centuries humans have pondered over the nature of intelligence. Many have created theories to develop a concrete understanding of its overall concept. In addition to disagreements about the basic nature of intelligence, psychologists have spent a great amount of time and energy debating the various influences on individual intelligence. The debate focuses on one of the major questions in psychology, which is more important Nature or Nurture? Charles Spearman proposed a general intelligence factor, g, which underlies all intelligent behavior. Many scientists still believe in a general intelligence factor that underlies the specific abilities that intelligence tests measure. Other scientists are skeptical, because people can score high on one specific ability but show weakness in others. Alfred Binet and Theodore Simon (Simon and Binet, 1905) produced the first form of modern intelligence testing in 1905. The test had a practical purpose and was used to identify children who may need extra help with their school work. Due to the purpose of the test, the exercises Binet and Simon asked the children to complete were very similar to tasks the children completed within schools, i.e. measures of vocabulary, comprehension of facts and relationships and mathematical and verbal reasoning. The Binet & Simon test was later modified and extended by Lewis Terman and his associates at Stanford University where it was translated for use in the United States (Terman 1916, Terman and Merrill, 1937). The test became known as the Stanford-Binet test and is still being used referred to as Intelligence Quotient; (I.Q). the I.Q. score was calculated by comparing the child’s chronological age, (which means their age is years and months), with their mental age (which refers to the child’s ability to solve problems of certain levels.) i.e if a child could answer questions