Researchers in the field of Learning/Instructional Design and Technology have been engaged in productive scholarly endeavors at the intersection of Learning Design, User Experience, Human-Computer Interaction, and associated disciplines for some time. This edited volume captures the collective voices of authors working in this area. This book focuses on explicating the ontological and epistemological underpinnings of user-centered design and user experience as applied in the field of Learning/Instructional Design and Technology with the goal of foregrounding the importance of learner experience as an emerging design paradigm for the field. This volume is comprised of 15 chapters and organized into three parts: (1) Methods and Paradigms (5 chapters), (2) Conceptual and Design Frameworks (6 chapters), and (3) LX Design-in-practice (4 chapters). This volume serves as a contribution to an emerging, transdisciplinary, and complex phenomenon that requires multiple literacies. LX is not only concerned with the effectiveness of designed learning interventions, but also with the interconnected and interdependent relationship between the learner- (or the teacher-/instructor-) as-user, the designed technology, novel pedagogical techniques or instructional strategies, and the learning context. The diversity and breadth of perspectives presented herein serve as a topographical sketch of the emerging focus area of learner experience and represent an opportunity to build upon this work in the future.