This work was supported by a grant from Shalem Fund This study examined the use of TATOO (Danial-Saad & Chiari, 2017) to assess motor skills in touchscreen operation among 120 adults with intellectual and developmental disabilities (hereinafter: IDD) aged 21 and over. The study focused on adapting TATOO's user interface (UI) and examining its feasibility for this population. The findings showed a significant correlation between the IDD level, the age, ...