Abstract
In this paper we introduce the object of study of this special issue of Amerindia, the inflectional classes of the Oto-Manguean languages of Mexico, together with their most relevant typological characteristics. These languages are rich both in the variety of their inflectional systems, and in the way these are split into inflection classes. In effect, the full typological range of possible inflection class systems can be found just in this one stock of languages. This is illustrated through a survey of the variety of morphological forms, assignment principles, and paradigm structure, as well as the effects of combining multiple inflection class systems across different exponents within a single word form.