Teacher as teller is a short talk that provides the background information to the reading or viewing. It ensures that all students approach the reading or viewing with the necessary background information.
A great deal of vocabulary in subject specific texts is new and unfamiliar to students. Some words have been heard but not seen in writing, making it difficult for students to recognise and pronounce the word.
It is very frustrating for high school teachers to have students in their classes whose reading abilities are not strong enough for them to be able to learn the content and skills necessary for success.