This chapter addresses the role of proficiency in a prior non-native language (L2 proficiency) on transfer in third language learning. It discusses some methodological considerations and gaps in previous research, while also bringing up conceptual difficulties in defining, operationalizing and measuring L2 proficiency. An empirical study is presented on the role played by overall proficiency in L2 German on the occurrence of transfer in L3 English written production in Spanish/ Catalan bilingual learners (n = 73). The statistical treatment of the data relied on an ANCOVA with number of transferred items as the dependent variable and L2 proficiency as the independent variable. Biological age and proficiency in the target language (L3 proficiency) were used as covariates in this analysis.
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