The purpose of this study is to perform the validity-reliability analysis of the three subtests of Basic School Skills Inventory 3--Mathematics, Classroom Behavior and Daily Life skills--and do its adaptation for four to six year-old Turkish children. The sample of the study included 595 four to six year-old Turkish children attending public and private schools. The schools were selected from among the central towns of the province Konya based on random sampling method considering the social-economic conditions. For the reliability of the subtests of the Basic School Skills Inventory--that's Mathematics, Classroom Behavior and Daily Life and Skills--analyses were made to determine the internal consistency (Cronbach's Alpha), split-test reliability and test-retest reliability coefficient. The validity of the inventory was measured using construct, content and concurrent validity. The results showed that the Basic School Skills Inventory--Mathematics, Daily Life and Classroom Behavior Skills--was a reliable and valid instrument for Turkish children aged four to six years.