I have helped run one-off workshops for children to use EV3 mindstorms robots. Having also run similar workshops with other robots, the EV3's seem to generate the best response from the children. One simply needs to make a maze out of tape show some basic instructions for how to program the EV3 motors and the children will enthusiastically go about getting the EV3 to run the maze. I have also helped students build some more complicated robots for a robotic musical orchestra which was really fun, and a task the EV3 robots are well suited for. These are great robots, I only wish they were a little more affordable for poorer schools.