Language Learning Development (LangLearn) is the EVALITA 2023 shared task on automatic language development assessment, which consists in predicting the evolution of the written language abilities of learners across time. LangLearn is conceived to be multilingual, relying on written productions of Italian and Spanish learners, and representative of L1 and L2 learning scenarios. A total of 9 systems were submitted by 5 teams. The results highlight the open challenges of automatic language development assessment.