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At what age can testing begin?

A number of tests can be administered from as early as two to three years of age. However, a lower age at testing means a lower stability of the intelligence test results. This is partly due to the accelerated developmental processes that occur at a young age. Higher intelligence found in a very young child may also represent a developmental advantage that same-age children catch up to later. Intelligence can be measured more reliably with tests starting at around five years of age. However, very strong individual variations are still possible as well. Thus, to address specific diagnostic questions, recent test results should be obtained for children of preschool and primary school age on a case-by-case basis. It is important to ensure that the test content and the questions to be answered by the test results are in line with each other.