The chapters included in this book will report on the various technical and theoretical aspects of experimental SLA research across a number of typologically different languages. The book includes detailed chapters outlining the key theoretical claims and methodological requirements underpiniing this kind of SLA research. Many of the subsequent chapters report Procesability Theory-related studies to the wider field of SLA research. Though the emphasis is on cross-linguistic experimental research undertaken within the parameters of Processability Theory, the book nevertheless sheds the light on the nexus between bilingualism and theory-driven second language acquisition research.