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From Yakaboo:

Whatever age you decide to learn a foreign language, a positive attitude and the right learning methodology will guarantee success. The Passwort Deutsch series of textbooks and auxiliary material, written exclusively in German, has become widespread in recent years. The reason for this, as you might guess, is an effective approach to learning and a proper distribution of workload. This programme is structured in such a way that both beginners and those who already have some German language skills can start learning. Learn with pleasure and results!