Now draw in the connecting lines, e.g. down from the headteacher and then across the page and down to each of the three deputy heads. Then from them down to the staff who report to them ie that they have particular responsibility for, and so on. Those lines are the lines of responsibility. If you start at the bottom of your chart, you can follow the lines up to see which person is the line manager for each staff member. All lines eventually lead up to the head teacher, who has overall responsibility for the school.