The present volume provides a cross-linguistic perspective on the development of tense-aspect in L2 acquisition. Data-based studies included in this volume deal with the analysis of a wide range of target languages: Chinese, English, Italian, French, Japanese, and Spanish. Theoretical frameworks used to evaluate the nature of the empirical evidence range from generative grammar to functional-typological linguistics. Several studies focus on the development of past tense markers, but other issues such as the acquisition of a future marker are also addressed. An introductory chapter outlines some theoretical and methodological issues that serves as relevant preliminary reading for most of the chapters included in this volume. Additionally, a preliminary chapter offers a substantive review of first language acquisition of tense-aspect morphology. The analysis of the various languages included in this volume significantly advances our understanding of this phenomenon, and will serve as an important basis for future research.