I was writing a text for the preparatory school I work for. I do not consider myself a good material writer, and that is why I had avoided such a responsibility until 15 years ago. Back when I was working for an English (conversation) school in Japan, I did all my best to ask my boss to assign me not to the material development section, but to the teacher training section. Such a person has now published as many as ten books (and another is coming out soon!), and contributes a text to a prep school. You never know what is in store.