Significance of Study INTRODUCTION

As said above every human or individual will possess some amount of intelligence. We may be able to say whether the individual is less intelligence or more intelligence on the basis of his performance in activities. But to know the exact quantity of intelligence possessed by an individual, administration of an intelligence test is essential. Hence, in order to know a quantitative measure, a German psychologist by name William Stern proposed formula as below : Mental age shows a person behaviour that reflects people from certain age of group, or it can be said a mental ability of a person. Actually mental age is age level of human mental ability, it also measured by standardized intelligence test. Meanwhile chronological age shows the real age of a person from the date he was born. Spencer defines Intelligence as the capacity of the organism to adjust itself to an increasingly complex environment. Alfred Binet stated intelligence as something which sencory acuity test or reaction time experiments measure. Based on Terman the American psychologist, he is best known for his revision of the Stanford-Binet IQ test. Abstract thinking is one of intelligence abilities that involvesthe way of person solve problems, his critical thinking adn, etc. The way a person face problems, the way a person take a decision involving y IQ. Those the ways is supported by Munn explanation that intelligence as the capacity for flexible adjustment. And Goddard said intelligence is the degree of avalibility of one‟s experience for the solution of immediate problems and the anticipation of the future ones. A person who looks smart they are able to maintain their thoughts, express ideas, they can estimate something in good way also explained by Spearman, intelligence is the capacity for constructive thinking, which involves a discovery of appropriate qualities and relations of the ideas, that are before us and bringing in of the other relevant ideas. All these definitions define intelligence in their own way, in view of this problem many psychologist have accepted a definition by Weschler. He said Intelligence is the aggregate or global capacity of an induvidual to think rationally, to act purposefully, and to deal effectively with his environment 11 . Commonly IQ is not only uses in educational field, it also uses as a reference in worklife. In educational field IQ tests are given to diagnose students at school. Usually it helps school and stake holders to diagnose students who have difficulty in learning, so it may help the teachers to evaluate through teaching and learning activites. Every individual in a society will have some amount of intelligence. Some may harder to solve something, some may be average, and some other people maybe more intelligent. There are some students who taking time to study and facing problem in some subjects and also having lower score. There are students who learn easier rather than others and almost have no problem during learning. There are also some students who learn normally and have stabil achievement with some subjects at school. Those cases usually can be proven by the score of IQ. Another function is that the IQ is to classify student to the next level or next grade in school. For some schools in Indonesia reaching next grade year at junior high school there is a classification. And score of IQ is used as reference for school to classified students to those kind of classes. As the writer mentioned before IQ test is also used in some big companies for the purpose of job interview. 11 Aman Sharma, www.psychologydiscussion.netessaysintelligence-essay-on- intelliegence-940-words608.