“…Looking at the way in which the age/periods of exposure to languages are operationalised in relation to interlocutors and contexts, we observe diverse levels of granularity. A large set of questionnaires asked about the length of exposure (across different interlocutors or contexts) from a specific age, which is either pre-specified or to be determined by the informant (Antonijevic-Elliott, n.d.; Antonijevic-Elliott, Lyons, O’ Malley, Meir, Haman, Banasik, Carroll, McMenamin, Rodden & Fitzmaurice, 2020; Scharff-Rethfeldt, 2012a; Arredondo, 2017; Gagarina, Klassert & Topaj [questionnaires for preschool and school children], 2010; Prentza, Kaltsa, Tsimpli & Papadopoulou [questionnaires for children and parents], 2017; De Houwer, 2002; Byers-Heinlein, Schott, Gonzalez-Barrero, Brouillard, Dubé, Laoun-Rubsenstein, Morin-Lessard, Mastroberardino, Jardak, Pour Iliaei, Salama-Siroishka & Tamayo, 2019b; Blumenthal & Julien, 2000; de Diego-Lázaro, 2019). Another set of questionnaires documented language experience separately for each year of life, with the important difference that the number of years varies across the questionnaires (first eight years of life in Peña, Gutiérrez-Clellen, Iglesias, Goldstein & Bedore [BESA:BIOS, Parent], 2018; every year until the child's age at time of testing in Unsworth, 2013; three years of preschool and five years of primary school in Cohen, 2015a).…”