Alvin Daniel, a senior technical program manager at PlayStation, said the device was designed with three principles in mind to make it “broadly applicable” to as many players as possible. First, the player does not have to hold the controller to use it. It can lay flat on a table, wheelchair tray or be mounted on a tripod, for instance. It was important for it to fit on a wheelchair tray, since once something falls off the tray, it might be impossible for the player to pick it up without help. It also had to be durable for this same reason — so it would survive being run over by a wheelchair, for example.