This edited volume presents narratives on a range of methods for research on second language teaching and learning appropriate to the elementary, middle, and high schools (K-12). Teacher researchers in different worldwide contexts narrate their processes to explain and demonstrate practitioner research in context; contributors describe their research from exploring the rationale for the project, to designing the study, analyzing the data, and disseminating it. As such, the book illustrates how K-12 practitioners design, gather, analyze, interpret, and strategically employ data to make data-driven, evidence-based, and analysis-informed instructional, assessment and programmatic decisions. This volume empowers teacher-researchers and allows them to envision research projects in their own classrooms. Offering new insights into the researchers’ thinking processes, challenges, and solutions, and advocating teacher research for understanding learning, the teaching of language, and the development of SLA, this text will appeal to educators and researchers involved in language education, second language acquisition, TESOL, ESL/EFL/ELT, and applied linguistics.