The movement towards multilingualism and multiculturalism in South Africa has placed language at the centre of all educational activity. The focus in this book is on determining the criteria for developing relevant materials to develop learners' proficiency in Afrikaans during a short remedial intervention programme. Through different action research cycles, the developed materials were scrutinised in terms of the theoretical criteria, implemented in the classroom to establish their effectiveness, and refined to suit the proficiency level of particular learners. This book, therefore, attempts to show how to design appropriate and relevant additional language teaching materials for enhancing learners' proficiency in an additional language, guided by set of criteria. Comprehension of these mechanisms may add to an understanding of the process of developing appropriate and relevant materials and allow teachers to be innovative and creative. The knowledge gained in this book, constitutes the basis for the materials writer and teachers becoming true professionals.