Abstract: The purpose of this work is to verify the relation between the cognitive development level of children from Amparo and Itapira cities, after having concluded pre-school, and their scholar performance in the basic cycle of 1st grade. The fundamental hypothesis is that the subjects who are concluding pre-school with higher cognitive development level present a better scholar performance in the basic cycle of 1st grade in relation to those with more elementary cognitive development levels. The population studied totalled 758 subjects in municipal schools for infantile teaching and 1st grade schools from Amparo and Campinas cities. The analysis of the results shows that the approbation freqüency score is higher among students who exhibited operatorial reasoning or near it Ver menos