Previous meta-analyses in this field lack profound moderator analyses and are based only on small sample sizes. Therefore, we meta-analytically synthesize the relationships between foreign language proficiency and six work-related outcomes (expatriation intention, cross-cultural adjustment, job satisfaction, job performance, life satisfaction, and turnover intention). The bivariate analyses are supplemented by several moderator analyses. The results expose significant relationships for all direct effects and uncover several significant moderators. The project shows that language skills are an important success factor. Thus, through language training, expatriates can better cope with the difficult situation abroad, and both recruiters and expatriates can increase the success of international assignments.
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