My own summary and views on a study by María José de la Fuente & Carola Goldenberg (2020), "Understanding the role of the first language (L1) in instructed second language acquisition: Effects of using a principled approach to L1 in the beginner foreign language classroom."  Should we strive to use the target language exclusively in class? Link to the article: https://doi.org/10.1177/1362168820921882