Critique the school district's plan. What fundamental advantage did this type of objective measurement offer compared to previous, more subjective methods? Conversely, what is a significant risk or flawed assumption in relying solely on a single score to make decisions about a student's educational needs?

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General intelligence tests emerged as a significant breakthrough in psychology during the early 1900s, offering an objective means to measure something akin to what we commonly refer to as intelligence. 

General Intelligence Tests

- How well people perform specific tasks
- How well someone will perform in a job
- How long someone might live

What Intelligence Tests can Predict

Intelligence tests have limitations and can't predict every aspect of a person's future. Other abilities like musical, physical, and interpersonal skills, acknowledged by Howard Gardner, go beyond what these tests assess. Success in life is influenced by factors beyond intelligence, including effort, support from family and friends, and luck. While standardized tests like SATs have value, we sometimes expect too much from them. We overestimate their predictive power and emphasize the qualities they measure while overlooking other important factors.

Limitations of Intelligence Tests

An intelligence test the measure the objective intelligence of a group the way that inelligence tests measure the intelligence of an individual. There are no widely used or created tests like this that exist. 

Intelligence Test for Groups

In the late 1800s, Sir Francis Galton pioneered the field of intelligence assessment by developing the first broad test designed to measure intelligence. Although he was not a psychologist, his foundational work contributed significantly to the concepts and development of modern intelligence testing.

Sir Francis Galton's Contribution to Intelligence Testing

David Wechsler was an American psychologist who, after working with World War I veterans, developed a new IQ test in 1939. He defined intelligence as a person's overall capacity to act with purpose, think rationally, and interact effectively with their surroundings.

David Wechsler

The modern era of intelligence testing was effectively launched by Alfred Binet, who is credited with developing the first significant and systematic tests to measure cognitive abilities.

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