If the objective is to fit 100% of the measured students, regarding seat height, they would need to use all 5 of the different type of seats defined in the mentioned standard. According to the obtained data (Table 2), students’ characteristics in school A implies the use of at least 3 types of seats and, 2 and 5 types for school B and C, respectively. Therefore, this situation clearly shows the high body dimension variability in this particular school grade.