This book covers crucial knowledge and skill sets for developing language tests and setting assessments. Aimed at practitioners of applied linguistics and TESOL and complete with online resources in a companion website for students and lecturers, the book: - covers the theoretical and methodological framework and rationale for language test use, assessment techniques in different language skills and basic strategies for analysis of test quality - stresses the importance of test reliability, validity and fairness in language assessment - provides its audience with theoretical and practical knowledge in language assessment - forms an accessible gateway into the often intimidating world of language assessment, and a unique opportunity for the readers to ground their knowledge of principles in language assessment research. This book equips readers with the ability to use theories and principles in language testing and assessment to design and use language tests and assessments optimally, given the available time and resources in a given context, and promote good practice and research in language testing and assessment.