A field of study that is at once vibrant and interdisciplinary such as second language acquisition (SLA) tends to rely on myriad theories, hypotheses, and frameworks. Essentials of SLA for L2 Teachers, a booklet containing a proper balance between theory and practice, has come at an opportune moment. For it presents arguments pertaining to the multifaceted nature of second language acquisition and also suggests practical instructional solutions. Specifically, the book discusses elements of a transdisciplinary framework characterizing SLA as situated in social and cultural milieu—a clear departure from the traditional, cognitive SLA.