Tim McNamara’s work has had a fundamental impact on language testing. This volume brings together over 20 leading scholars in language assessment whose work has been influenced by Tim McNamara. Their papers cover issues of the social impact of language tests, such as fairness and justice of test use and language testing in the context of migration. They also address testing of interaction, and teachers’ and students’ views of language tests. The volume concludes with papers discussing the future of language testing in the face of contested concepts of validity, the rise of social media, and lingua franca language use.