Daftar Isi:1. Introduction triggers for language variation 2. Germanic and Romance onset clusters - how to account for microvariation 3. The use of gerunds and infinitives in perceptive constructions the effects of a threefold parametric variation in some Romance varieties 4. Adverb and participle agreement for a parameter hierarchy in Italo-Romance microvariation 5. Why a bed can be slept in but not under variation in V P constructions 6. Deriving idiolectal variation English wh-raising 7. On the variable nature of head final effects in German and English an interface account 8. Variation and change in Italian phonology on the mutual dependence of grammar and lexicon in optimality theory 9. Which clues for which V2 a contribution to the typology of V2 on the basis of old Italian 10. Parameter typology from a diachronic perspective the case of conditional inversion 11. Attrition at the interfaces in bilectal acquisition (Italian/Gallipolino) 12. Little v and cross-linguistic variation evidence from code switching and the Surinamese creoles 13. On language acquisition and language change is transmission failure favoured in multilingual heritage contexts