This document summarizes three case studies related to challenges with group work involving culturally diverse students. Case Study 1 discusses low participation of international students, which was addressed through a structured intercultural program. Case Study 2 involved international students misunderstanding an assessment, highlighting the need to clarify expectations. Case Study 3 addressed unequal contribution to group projects, which was partially solved through tracking individual work online. The document discusses benefits and challenges of group work as well as characteristics of effective groups.