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This volume brings together seven empirical studies about aptitude-treatment interactions (ATI), i.e., about how (second language) learners with different aptitudes match or don't match with different educational treatments; and aptitude-testing interactions, i.e., about how learners with different aptitudes perform better or worse depending on the way their knowledge and skills are tested. The authors are all established researchers or rising stars in the field of second language acquisition (SLA), who believe that little can be said about the effectiveness of teaching and testing methods or techniques without taking individual differences into account. Many of the studies corroborate in SLA what has become a central finding in the psychological and educational research about ATI: the more a method puts the burden of information processing on the student, the bigger the role of the corresponding aptitudes. The kinds of findings documented in this volume contribute to a scientific basis for the art of language teaching that will become increasingly useful as emerging technologies make adaptation to individuals and groups more feasible. Originally published as special issue of Journal of Second Language Studies 2:2 (2019).