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Psychological development is a major issue in child health, as important as is physical growth. This paper describes the validation of a screening developmental test, the PRUNAPE (Prueba Nacional de Pesquisa), in Argentina. What is needed from a developmental test is recalled, and the details of the validation of the test are given, with the Bayley test and the WISC test as gold standards, along with the process of the clinical validation of the test with 654 children under 6 years of age from a suburb of Buenos Aires.The test has a very good positive predictive value, .94, a negative predictive value of .78, a rate of false positive of 6% and a rate of false negative of 22%. Developmental testing will be more and more important for early screening and intervention.