A case is a description of an actual situation, including one or more difficult problems, and may also include methods to solve these problems; the teaching practice of teaching case descriptions, which teaches people in a rich narrative form It shows some stories that include typical behaviors, thoughts, and emotions of teachers and students; an educational case is a story about an educational situation. While narrating a story, people often express some of their own opinions, that is, comments. So a good case is a vivid story plus wonderful comments.