3. Intelligence is not a thing. Its only
an idea, an abstraction.
Its measurement is not possible in
the same way as we measure a piece
of cloth or temperature of our body.
So, we measure intelligence of
an individual with the help of
intelligence test.
4. The first attempt to measure
intelligence was made byAlfred
Binet with the help of his friend
Simon.The scale they made is
known as Binet Simon Scale.
Binet observed that as children
advance in age, the difficulty level of
the tasks they can perform also
increases.
5. The Concept of Mental Age
Binet conceived the idea of Mental
Age(MA) to measure intelligence. Tests
were made for different age levels. If a
test was passed by 60-90% of children of
a given age , Binet accepted it for that
age level. A child who successfully
perform all the tasks acceptable for the
five year old child is taken to have a
mental age of five, whatever his
Chronological Age (CA) may be.
6. Intalligence Quotient
Measurement of intelligence in terms of
MA raised many problems. To make the
comparison easy Stern devised the
concept of Intelligence Quotient,
popularly known as IQ.The intelligence
quotient is an index of the child’s
relative level of brightness as compared
with the other children of his age. IQ is
the ratio between the MA and the CA. It
is obtained by dividing the mental age
8. Distribution of IQ
Garret has classified people according to
their IQ.
IQ Classification
140 and above Very superior(gifted)(1.5%)
120 to 139 Superior
110 to 119 Bright
90 to 109 Average or Normal
(48% approximately)
80 to 89 Dull or Backward
70 to 79 Very Dull(Border line)
0 to 69 Feeble minded(mentally
retarded)
