Frontmatter -- Contents -- Contributors -- Introduction: [simple and complex?] -- 2. Reflections on Researching Dynamics in Language Learning Psychology -- 3. Interacting Levels and Timescales in the Emergence of Feelings in the L2 Classroom -- 4. Working with the Complexity of Language Learners' Emotions and Emotion Regulation Strategies -- 5. Nested Systems and their Interactions: Dynamic WTC in the Classroom -- 6. Researching the Complexity of Silence in Secondlanguage Classrooms -- 7. Researching Motivational Resonance Hands-on: Learner Self-concepts, Learning Groups and Educational Cultures -- 8. Understanding Motivation through Ecological Research: The Case of Exploratory Practice -- 9. Complexity as a Valid Approach in 'Messy' Classroom Contexts: Promoting More 'Ecologically Rich' Research on the Psychology of L2 Listening -- 10. Equifinality Approach to Exploring the Learning Trajectories of Language Learners and Teachers -- 11. Understanding Complexity in Language Classrooms: A Retrodictive Approach to Researching Class Climate -- 12. Investigating Group-DMCs and Complexity in the L2 Classroom -- 13. The Complexity Lens: Autoethnography and Practitioner Research to Examine Group Dynamics -- 14. A Collection of Contradictory Selves: The Dialogical Self and the Dynamics of Teacher Identity Transformation -- 15. Using Microgenetic and Frame Analysis in Language Teacher Cognition Research -- 16. Doing Complexity Research in the Language Classroom: A Commentary -- Glossary -- Subject Index -- Author Index