The Modern Language Journal released its Summer 2015 edition, in which I have contributed a brief write-up on the book Individual Differences, L2 Development, and Language Program Administration: From Theory to Application, edited by C. Sanz and B. Lado. Individual differences (IDs) encompass any difference – either biological or experiential – which can influence language acquisition from one learner to the next. Keeping with this broad definition, topics addressed in the book included: aptitude, working memory, age (55+), sensory disabilities, and study abroad. The book also highlights the inconsistency across teacher-training programs in addressing IDs. For those in language program administration, this is a go-to desk copy.