The aim of this study was to describe how speed and accuracy in eye controlled computer performance changed over time for children with severe physical disabilities that used eye tracker controlled system (ETCS) in daily activities as an effect of assistive technology (AT) intervention. Data was collected with diaries and with Compass software. The preliminary results from this study from the first four children indicate that two children improved significantly in eye controlled performance up to 19 months since start of ETCS usage in daily activities.