The JOBSTEM project, whose full title is "STEM career aspirations during primary schooling: A cohort-sequential longitudinal study of relations between achievement, self-competence beliefs, and career interests", is research project which brings together researchers from Croatia, France, Hungary and United States. The aim of this paper is to present the organization of projects cooperation and to discuss the way on which project tasks are divided among the research team members. An additional objective of the paper is to discuss major challenges researchers face in conducting such transnational research projects. As a STEM problem as a relatively new research area in Croatia and in many other European countries, JOBSTEM project also raises some new questions which will be discussed in the paper.