Summery-This paper analyzes the process of development of three-dimensional didactic resources created and tested with visually impaired students from Brazilian public schools which involved designers, teachers, and students collaboratively. The importance of interaction among the areas of Engineering, Design, and Education was also analyzed. The central results were the creation or adaptation of effective didactic resources as intermediary objects to help teachers, and visually impaired students in the teaching-learning process within the areas of Arts, Nature Sciences, and Mathematics. This paper points out the importance of collaborative activities involving users and designers along the process of assistive products development, measured with Rasch Analysis and through verbalizations of students, teachers, and designers.