In this volume, the authors discuss in detail LSP teaching in Poland and Slovenia. For this purpose, they deal with the basic areas of LSP teaching, starting with the definition of LSP, and then needs analysis, the development of syllabuses and curricula, the preparation of LSP teaching materials, the choice of appropriate teaching methodology and, last but not least, assessment. One chapter focuses on LSP teachers, discussing their roles and competences, pre-service and in-service education, professional development programmes, LSP teacher identity, and the professional challenges they need to negotiate in their teaching contexts and along their careers. EU projects to date in the field of LSP teacher education and professional development needs that address the growing and diverse needs of experienced and future LSP teachers are also presented (TRAILs, Catapult, and LSP-TEOC.Pro). Last, based on interviews with language teacher educators in Poland and Slovenia, the perspective is changed to describe the relevant elements of the pre-service education and in-service professional development as seen by this very important group of stakeholders.