If you are unaware that your child will need to be absent from school until the night before or the day of the absence, it is generally accepted that you should telephone or otherwise directly contact the preschool to inform them of your child's absence. However, some schools will allow you to inform them of absences through your child's renrakucho notebook, which you may give to the teacher on the preschool bus. Ask your child's preschool about their preferred method of communication.