The Effects of Mobile-Assisted Language Learning on Language Acquisition and Integration Outcomes: Evidence from a Randomized Controlled Trial in Integration Courses in Germany

This paper evaluates the effectiveness of a low-cost intervention combining Mobile-Assisted Language Learning (MALL) with behavioral economics insights, specifically motivational framing and near-peer role models. Using a randomized controlled trial among 317 migrants and refugees in German integration courses across six cities, I examine whether such an intervention can shift learning behavior and improve German language proficiency. The intervention raised adoption of the official state-recommended app "Ankommen" from 5% to 46% and doubled daily mobile learning time from 15 to 30 minutes. Intention-to-treat estimates show treatment increased self-reported German proficiency by 0.3 standard deviations, while Complier Average Causal Effect estimates indicate actual MALL adoption improved language skills by 0.76 to 0.83 standard deviations. These findings demonstrate that a brief, replicable encouragement intervention can meaningfully complement formal language instruction at negligible cost, offering a scalable policy tool for integration programs across Europe.