1. The determinants of diachronic stability / Anne Breitbarth, Miriam Bouzouita, Lieven Danckaert and Melissa Farasyn -- 2. Gender stability, gender loss: What didn't happen to German / Sheila Watts -- 3. Apparent competing agreement patterns in Middle Low German non-restrictive relative clauses with a first or second person head / Melissa Farasyn -- 4. Stability and change in Icelandic weather verbs: Syntax, semantics and argument structure / Sigr{ostrok}℗ður Smuunn Sigur℗ðard{acute}ottir and Th{acute}orhallur Eyth{acute}orsson -- 5. Disharmony in harmony with diachronic stability: The case of Chinese / Redouane Djamouri and Waltraud Paul -- 6. Against V2 in Old Spanish / Ioanna Sitaridou -- 7. V1 clauses in Old Catalan / Afra Pujol i Campeny -- 8. Competition, stability and change in the emergence of Brazilian Portuguese / Charlotte Galves -- 9. What is a diachronically stable system in a language-contact situation? The case of the English recipient passive / Achim Stein, Richard Ingham and Carola Trips -- 10. A variational theory of specialization in acquisition and diachrony / Joel C. Wallenberg -- 11. Stable variation in multidimensional competition / Henri Kauhanen -- Index.