The improvement of the quality of life (QOL) of children with disabilities has been considered important. Therefore, the Special Needs Education Assessment Tool (SNEAT) was developed based on the concept of QOL to objectively evaluate the educational outcome of children with disabilities. SNEAT consists of 11 items in three domains: physical functioning, mental health, and social functioning. This study aimed to verify the reliability and construct validity of SNEAT using 93 children collected from the classes on independent activities of daily living for children with disabilities in Okinawa Prefecture between October and November 2014. Survey data were collected in a longitudinal prospective cohort study. The reliability of SNEAT was verified via the internal consistency method and the test-pretest method; both the coefficient of Cronbach's α and the intra-class correlation coefficient were over 0.7. The validity of SNEAT was also verified via one-way repeated-measures ANOVA and the latent growth curve model. The scores of all the items and domains and the total scores obtained from one-way repeated-measures ANOVA were the same as the predicted scores. SNEAT is valid based on its goodness-of-fit values obtained using the latent growth curve model, where the values of comparative fit index (0.983) and root mean square error of approximation (0.062) were within the goodness-of-fit range. These results indicate that SNEAT has high reliability and construct validity and may contribute to improve QOL of children with disabilities in the classes on independent activities of daily living for children with disabilities. IntroductionChildren with chronic conditions often go through long-term treatment, which may be complex and may negatively impact their well-being. For children undergoing long-term treatment, as for all other children, school education is considered important for their growth and development (Kohara et al. 2012). In planning treatment and interventions for children with chronic conditions it is important to measure quality of life and health-related quality of life (HRQOL) (Taylor et al. 2008). In this context, the necessity of evaluating the educational outcome of children taking special needs education, based on their QOL, has been on the rise. Kohara et al. (2014b) verified the effectiveness of using HRQOL to evaluate educational outcome for the purpose of improving the QOL of children with disabilities, and to address the need for a tool for evaluating educational outcome according to the QOL of children with disabilities. The study results that they obtained confirmed that the classes on independent activities of daily living for children with disabilities are related with HRQOL. Based on those results, the Special Needs Education Assessment Tool (SNEAT) was developed by including therein the common components of the classes on independent activities of daily living for children with disabilities and HRQOL (Han et al. 2014). The classes on independent activities of daily living for children with...