Frontmatter -- Danksagung - Agradecimientos - Ringraziamenti -- Contents -- 1 Why WHY? -- 2 Word order, information structure, and wh-interrogatives in Italian and Spanish -- 3 Word order variation in Italian and Spanish WHY-interrogatives: current state-of-the-art and research questions -- 4 Data and methods -- 5 On the syntactic position of WHY: an analysis of WHY-x-V sequences -- 6 Subject positioning in Italian and Spanish WHY-interrogatives: disentangling the relevant factors -- 7 A syntactic account for subject positioning in Italian and Spanish WHY-interrogatives -- 8 WHY-interrogatives in Italian heritage speakers: at the interface between syntax and discourse -- 9 Conclusion -- Bibliography -- Index