We use "Kontakte 3" (yellowish-green) as our book, but we do our own conversation, vocabulary - work and grammar. What is discussed in class should be repeated at home, in form of exercises, given or made up. "That improves the learning process enormously". We have done cases, Pronouns, Strong + weak verbs in their 3 main tenses, word order and many words! Anyone with even a basic idea about the language is very welcome, it is a friendly, cooperative group.