The "Multidimensional Attitudes toward Inclusive Education Scale" (MATIES) was developed to effectively measure affective, cognitive and behavioural aspects of attitudes, within the realm of inclusive education that includes physical, social and curricular inclusion. Models within Item Response Theory and Classical Test Theory were used for calibrating the subscales. Using a sample of primary and secondary school regular teachers in Victoria, pilot study analyses indicate that the final three subscales of eighteen items successfully met standards for internal reliability, content validity, construct validity, criterion validity and convergent validity; and provide preliminary evidence to warrant further use of this instrument for the purpose of measuring teachers' attitudes toward inclusive education. (Contains 1 figure and 4 tables.)