The universal design for learning has been studied in recent years as a model for addressing diversity in the classroom. However, there are few scientific studies that provide data on their efficacy. The aim of this paper is to validate a tool which to evaluate the perceptions based on universal design for learning framework by professional, via confirmatory factor analysis, with a sample of 230 professionals. Reliability, factorial and criterial validity estimates are presented. A final scale was composite with 26 items: 9 items for principle 1, 8 items for principle 2 and 9 items for principle 3. Overall, the results shown that the scale had an adequate three-factor confirmatory solution, satisfying reliability indices, and adequate criterion-related validity. The authors conclude that we must advance in the effective measurement of UDL in the scientific literature, that the concept is constantly evolving and that, therefore, scientific literature and academic work should accompany this trend based on inclusion and the right of everyone to have an equal opportunity education.

Universal design for learning; Inclusive education; Teacher; Assessment.