The prototype system, called CoWriter, was developed by researchers at the Swiss Federal Institute of Technology (EPFL) in Lausanne. A humanoid robot, designed to be likeable and interact with humans, is presented with a word that the child spells out in plastic letters. The robot recognizes the word and tries to write it, with its attempt appearing on a tablet. The child then identifies and corrects the robot’s errors by re-writing the word or specific letters.