 Welcome to this unit which introduces the phonetic machinery for the articulatory and auditory classification of vowels. We have to understand these concepts to classify the vowels of the languages of the world. In the virtual session where you can use the question sheet as default guidance, but you can also go through all components on your own, we will look at the central parameters used for vowel classification and thus define several sets of vowels. The mastery worksheet is a dynamic multiple choice test with 10 questions about vowels, easy to pass after the virtual session. And the practical, like many other phonetic practicals, can be used for training, for vowel identification as well as for vowel notation. Quite challenging, but if you invest a reasonable amount of time, you'll manage.