One advantage is that he doesn't forget details. He knows each child's name, the parents names, and what each child knows and needs to know. In addition, he knows each child's pets and hobbies. Mr. Leachim doesn't make mistake Each child tells Mr. Leachim his or her name and then enters an umber. His computer brain puts the child's voice and ident number together. He identifies the child with no mistakes. Then he sta the lesson