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Updated: Sep 18, 2026

Measuring the Functional Abilities of Children Aged 3-6 Years Old with Observational Methods and Computer Tools
Published on: June 20, 2020
The uses and predictive limitations of intelligence tests in infants and young children
Insights
Intelligence tests for young children have limited predictive validity for adoption policies. Parent intelligence and comprehensive child assessments offer more reliable insights for adoption decisions.
Area of Science:
- Child Psychology
- Developmental Psychology
- Adoption Studies
Background:
- The World Health Organization sought to evaluate the predictive validity of infant and child intelligence appraisals for adoption policy.
- Existing research indicates limited predictive significance of mental-test performances in children under six years of age.
Purpose of the Study:
- To determine if intelligence assessments of young children are reliable enough for adoption policy decisions.
- To explore the utility of parental intelligence quotients and other factors in predicting a child's future development.
Main Methods:
- Review of studies on the predictive validity of intelligence tests in children under six.
- Analysis of the significance of parental intelligence quotients (IQ) in adoption contexts.
- Consideration of additional factors beyond cognitive tests, including developmental history, health records, and medical/neurological examinations.
Main Results:
- Mental-test performances in children under six have minimal predictive significance.
- Reasonable prediction accuracy is achieved around age six in approximately 37% of cases.
- Parental IQ scores (above 90) offer better predictive guidance than infant tests alone, especially when other factors are considered.
Conclusions:
- Infant intelligence tests alone are insufficient for dependable adoption policy criteria.
- A holistic approach, integrating parental IQ, child's developmental history, health, and medical evaluations, is recommended.
- Adoption policies should consider the needs of prospective parents, guiding those seeking high-ability children towards older adoptees where prediction is more accurate.
Abstract:
The author was asked by the World Health Organization to examine whether appraisals of intelligence of infants and young children show enough predictive validity to be dependable criteria on which to base adoption policy. Studies have shown that mental-test performances by children under 6 years of age have little predictive significance, although reasonable prediction may be made in about 37% of cases at the age of 6 years. Moreover, too much importance should not be given to the tested intelligence of parents, particularly those tested under stress, unless their intelligence quotients are over 90; it provides, however, a better guide, taken alone, than do the tests on infants alone. Tests on infants should be considered together with those on the parents and with a number of other factors, including a full developmental history of the child, its health record, and the results of a medical and neurological examination. The author concludes by saying that the major emphasis in adoption should perhaps be placed on the needs of the adopting parents; those who would only respond to a child of high ability should be urged not to adopt an infant but rather a child who has reached an age where prediction can be more accurate.
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