Abstract: A method for early diagnosis of autism spectrum disorder (ASD) in a child, characterized in that four movement sensitivity parameters are measured during an interaction of examined child with a touch screen, characterized in that: Linear Movement Precision (LMP) is measured by calculating variation between a line drawn by ASD child and a line drawn by TD (typically developing) child; Polygonal Movement Precision (PMP) is measured by calculating the smallest area of a polygon drawn with knots generated by ASD child and of a polygon drawn with knots generated by TD child; Movement Acceleration Stability (MAS) is measured by calculating jerk defined as first derivative of acceleration while drawing a line by ASD child and while drawing a line by TD child; Pressing Force Value (PFV) is measured so that the touch screen is placed on flat surface and force applied by ASD child or TD child while drawing a line is measured, and wherein, the force values are calculated and compared.