HIGH VALIDITY AND RELIABILITY OF SCHOOL READINESS QUESTIONNAIRE MEASURING INSTRUMENT FOR KINDERGARTEN CHILDREN IN INDONESIA SAMPLE

School readiness refers to children's competence and to get accustomed to school demands. Measuring children's school readiness is deemed useful to recognize their initial achievement and to restrict any potentials of low achievement occurrence. However, the shortage of standardized measuring instruments for school readiness is the most exclusive reason why this research is of importance to bring up. This research, in essence, aims at elaborating an equitable and made consistent measuring school readiness instrument for kindergarten student Grade B in Indonesia using the School Readiness Questionnaire that has six primary aspects: academic competence, essential thinking skill, socio-emotional maturity, physical ability and motor development, self-discipline, and communicative competence. The sample of this study is 260 students (aging between 5-7 years old) from 42 kindergarten schools throughout the Malang City in Indonesia, using a quota sampling technique. The procedures of this current research comprised translating, testifying the content validity by experts, confirmatory factor analysis used to analyze construction validity using confirmatory factor analysis, and testing the internal reliability with Cronbach's Alpha. The results show that (1) the 34-item school readiness questionnaire has high validity; (2) there is high internal validity (a from 0.81 to 0.93). Therefore, the scale of school readiness is an entirely and highly valid and reliable scale, and it would be a useful tool for educators and scholars for measuring children's readiness for school.