Diekmann I, Fröhlich JJ. How Can Migrants’ Language Proficiency Be Measured? A Discussion of Opportunities and Challenges When Studying the Impact of Language Skills on Social Position . Migration Letters. 2020;17(5):695-704.Language proficiency is crucial for migrants’ social position in the labour market and therefore plays a key role in the (re-)production of social inequalities in modern societies. There are different ways of capturing language skills in quantitative studies. However, it is important to question the extent to which existing language measures mirror migrants’ realities and relevant linguistic everyday life practices. In our paper, we contribute to this question by disentangling various measures of language proficiency. W...