Dolors Masats is a senior lecturer and researcher at Universitat Autònoma de Barcelona. She has led various research projects at national level and published widely in the field of conversational analysis applied to language learning in multilingual and multicultural settings, including language awareness, task-based and project-based teaching and learning, technology-enhanced learning, video production and education for indigenous peoples. Luci Nussbaum is an honorary professor at Universitat Autònoma de Barcelona, where she founded the Research Centre for Plurilingual Education & Interaction (GREIP). She has specialised in the study of oral interaction in multilingual language learning milieus from the perspectives of interactional sociolinguistics and conversational analysis and has led and participated in numerous research projects and research networks both at national and international level.