The papers in this volume derive from the 13th International Morphology Meeting (Vienna 2008). They all address the main topic of the meeting, viz. variation and change in morphology. Inflectional and derivational morphology are represented on equal terms. The focus is on cases of language-internal variation, such as pattern competition, base variation, form-function mismatches, or morphological pleonasm. Other recurring themes are language contact as a cause of variation, the output-orientedness of morphological patterns, and linguistic economy.The contributions cover a wide variety of languages, both Indo-European (Romance, Germanic and Slavic; Latin, Lithuanian and Romani) and non-Indo-European (Hungarian, Maay, Chinese).