This edited volume consists of seven papers dealing with “language at the interface”. The title is intended to articulate multiple, boundary-crossing perspectives from which to investigate language and language use. Such perspectives, though diverse in approaches and purposes, are adopted in order to better account for issues arising from language used in the ever-changing world than is usually possible. As a whole, the papers in this collection share and encourage a perspective that circumvents an applied versus theoretical dichotomy and hints at the potential fertilization of crossing disciplinary boundaries.