This book focuses where assessment has greatest relevance—the classroom. A great deal of research related to assessment is focused on ‘the testing industry’, high-stakes language proficiency testing, and related analytical and statistical reports that are far removed from teachers’ and students’ experiences in the classroom. Recently, more attention has been paid to assessment in language classrooms and the many challenges that teachers face in both measuring and promoting student learning. This book contributes to the body of knowledge related to teacher assessment competence, and how it is manifested in the decisions they make about assessment procedures and instruments in their classes. Focused on specific challenges related to classroom assessment, each chapter reports on particular assessment issues faced by teachers, their choices regarding such issues, and the consequences (actual or anticipated) of their decision-making. This book will interest the thousands of teachers globally dealing with the numerous challenges associated with effective classroom assessment in language learning. This collection of teacher voices, stories, and investigations provides possible solutions to such challenges, and will serve to promote assessment literacy in the language teaching profession.