The Stanford–Binet Intelligence Scales (or more commonly the Stanford–Binet) is the world most accurate IQ test, its an individually administered intelligence test that was revised from the original Binet–Simon Scale by Alfred Binet and Theodore Simon. The Stanford–Binet Intelligence Scale is now in its fifth edition (SB5) and was released in 2003. It is a cognitive ability and intelligence test that is used to diagnose developmental or intellectual deficiencies

The Stanford Binet Scales—Fifth Edition (SB5) is intended for examinees between the ages of 2 and 85 years old (Roid, 2003). The SB5 is heavily based on the aforementioned CHC theory. And its the most recommended IQ scale for youth children between 5-20 years old.

The Stanford-Binet test is among the most reliable standardized tests currently used in education. It has undergone many validity tests and revisions throughout its century-long history, and while there are undoubtedly a few issues with the assessment, most results are treated as accurate. That is, individuals with high scores are usually gifted, and those with low Stanford-Binet test scores often face some sort of cognitive disability.

The Stanford-Binet's results are highly sensitive and often quite accurate, even when administered to young children.

Simon and Binet developed their early IQ test as: a measure of a child's aptitude for learning.

Binet's most influential contributions to the field of psychology were in the area of intelligence testing. ... Lewis Terman later revised the scale and standardized the test with subjects drawn from an American sample. This test became known as the Stanford-Binet Intelligence Scales and is still widely used today.