The validity of educational measurement of characteristics modelled in the structure of oppositional pairs is determined, among other things, on matching the rating scale to the properties of the operationalised variables. 270 people participated in the study of this issue. The results revealed the significance of the type of rating scale and its length in determining the results of characteristics measurement.

The study aimed to construct and validate the Inclusive Competences Scale for educators (InComSedu). The basis for item generation was the “Profile of Inclusive Teachers”, a document developed by the european Agency for Special Needs and Inclusive education. Items were measured on a 5-point Likert scale. In order to test the validity and internal consistency of the scale, item analysis, exploratory and confirmatory factor analysis and Cronbach’s α were used. on a sample of Slovenian educators factor analyses proved the InComSedu had seven subscales: Team working and cooperation with others, Implementing knowledge about inclusive education and support, reflecting on and learning from inclusive practice, optimising challenges and approaching interdisciplinary, Accepting professional responsibility for each child’s development, Promoting resilience and professionality, and empowering children’s life skills. results indicate that InComSedu is a valid and reliable instrument for the evaluation of inclusive competences among educators.