The need for qualified Spanish language and bilingual education teachers in school districts across the country presses colleges and universities to train competent, linguistically proficient teachers. Here is where Lingüística aplicada: Adquisición del español como segunda lengua, Second Edition, plays its role: to clarify to future teachers important aspects of the Spanish language, situated in their cultural context, relevant notions of second language acquisition, and issues of technology and assessment, to prepare them for the task they face in the schools. Lingüística aplicada can help bridge the gap between second language research in Spanish, the typical Spanish language curriculum, and educational methodology courses, by providing grounding in issues and concepts that are often problematic for English-speaking learners of Spanish. Lingüística aplicada: Adquisición del español como segunda lengua, Second Edition, challenges prospective teachers to develop critical thinking skills in preparation for making meaningful choices as they select materials, prepare texts, and meet unforeseen problems in the classroom. To this end, throughout the text students are challenged to take a more active role in their training and ask themselves why and how.