This volume honours Peter Skehan’s landmark contributions to research in Task-Based Language Teaching. It offers state-of-the-art reviews as well as cutting-edge new research studies, all reflective of key theoretical and methodological issues in current research, such as the role and nature of task complexity and the distinct dimensions of L2 task performance. Collectively, these chapters celebrate Professor Skehan’s seminal influence on TBLT and second language acquisition research, and they bear witness to the sustained academic mentoring and collaboration that have characterised his career. Contributed both by senior academics and more recent participants in SLA and TBLT research, the chapters variously explore conceptual frameworks and methodological insights on central issues in TBLT research, theoretical debates, innovative research paradigms and methodologies, as well as practical pedagogical proposals. The book provides a wide-ranging and balanced account of Skehan’s work and its impact on other researchers, serving as an introduction as well as a critical review for both seasoned and novice researchers and for interested practitioners.