Measuring pre-service teachers' attitudes towards inclusive education: Psychometric properties of the TAIS scale

•A scale measuring attitudes towards inclusive education was developed.•Five samples were used to study the scale.•The scale was unidimensional and had good psychometric properties.•It is recommended for use among teachers and pre-service teachers.

The Teachers' Attitudes towards Inclusive Education (TAIS) scale was designed to measure pre-service teachers' attitudes towards inclusion, as defined in the Salamanca Statement of UNESCO. The 10-item scale was developed using a sample of 185 final-year pre-service subject teachers. It was validated in four subsequent studies with various samples of teachers and pre-service teachers. The unidimensionality of the scale was established in all samples except the first-year students, and its validity was confirmed in psychometric analyses. The scale is suggested for use in intervention studies aiming to develop positive attitudes towards inclusion among teachers and pre-service teachers.