"One Happy Classroom" is a basic children's book that details a day in the life of an elementary classroom. The story starts with an illustration of a clean classroom at the start of the day. As the day wears on, the book describes the different activities and procedures that takes place both inside the classroom, and outside the classroom. The book shows the students during nap time, recess, lunch time and eventually the end of the day where the classroom is a complete and total mess.