This chapter provides results from a case study utilising the ATC21STM assessment portal in the context of pre-service teacher education in Finland. The results from the portal are combined with a questionnaire regarding teamwork and collaboration dispositions. Twenty-four pre-service teachers completed both these measures. The students of this study were following two divergent teacher education programs that had different profiles in terms of their study contents and methods of studying. The participants of both groups tended to be highly disposed to collaborate and work in teams, and their collaborative problem solving skills can be described as very good. The participants’ measured social skills and self-assessed disposition to negotiate in the collaborative processes were strongly associated.