The Teachers’ book 2 has an extensive how to use guide in order for the teacher to take full advantage of the material. It also has the keys to the exercises of the Textbook and the Workbook.
It is short, but very handy and quick to use, as the teacher, at a glance, may find out what the communicative goals of the lesson are, what grammatical phenomena are presented, as well as the pronunciation of the words that need focus and practice.