Manuel D az-Campos is Professor of Hispanic Sociolinguistics at Indiana University, Bloomington, USA. He has published on the acquisition of sociolinguistic variables in L1, sociolinguistic variation including phonological and morphosyntactic phenomena, acquisition of second language phonology, and topics in Spanish laboratory phonology. His research appears in notable journals, such as Language in Society, Probus, Lingua, and Studies in Second Language Acquisition, among others. He is the editor of The Handbook of Hispanic Sociolinguistics (2011) and the author of Introducci n a la Socioling stica Hisp nica (2014). Kimberly L. Geeslin is Professor in the Department of Spanish and Portuguese at Indiana University, USA. Her research focuses on second language Spanish and the intersection of Second Language Acquisition and sociolinguistics. She has published research articles in Studies in Second Language Acquisition, Language Learning, Hispania, and Spanish in Context, among others. She is co-author of Sociolinguistics and Second Language Acquisition (2014) and the editor of The Handbook of Spanish Second Language Acquisition (2013). Laura Gurzynski-Weiss is Associate Professor in the Department of Spanish and Portuguese at Indiana University, USA. She investigates interaction- and task-based classroom instructed Second Language Acquisition, feedback provision and perception, instructor cognition, research methodology, and the role of interlocutor and instructor individual characteristics as well as learner individual differences. She is the founder and convener of the AILA Research Network on Interlocutor & Instructor Individual Differences in Cognition and Second Language Acquisition (www.individualdifferencesinsla.com). Her research has been published in edited volumes and journals, including Studies in Second Language Acquisition, Language Learning, Applied Psycholinguistics, The Modern Language Journal, Language Teaching Research, and Hispania.