Who developed the first intelligence test?

The intelligence test is a series of tasks designed to measure a variety of cognitive aspects such as individual differences, mental retardedness, educational backwardness, and learning disability. It gives a broader view of human's cognitive diversity and intellectual skills. 

Key Points

The first intelligence test which is known as 'The Binet-Simon Scale' was developed by Binet and Simon.

Let's Understand in Brief:

• In 1904, the French Government appointed Alfred Binet to develop a measure to identify children with notably below-average intelligence for their age, so that special education can be given to them.
• With this objective, in 1905 Binet with the help of Theodore Simon developed the first intelligence test, which is popularly known as the first Binet-Simon scale.
• This scale consisted of 30 problems measuring a variety of functions, such as judgment, comprehension, and reasoning. Binet believed that these functions are the essential components of intelligence. 
• The items were arranged in ascending order of difficulty. The items were administered to 50 normal children of 3 to 11 years of age, some mentally retarded children, and some adults in order to determine the difficulty level of the items. In this scale, no precise method to calculate the total score was available.

Hence, it could be concluded that 'Alfred Binet and Simon' have developed the first intelligence test.

Additional Information

• The first institutional effort to measure individual differences came from the British biologist Sir Francis Galton who administered simple tests of visual discrimination, determining the highest audible pitch and kinesthetic discrimination.