The paper presents an initial attempt to analyse party group cohesion in the Slovenian National Assembly based on an analysis of roll-call voting using the Rice cohesion index for a period of approximately one year commencing with the inauguration of the third parliamentary term. The study analyses the type of voting behaviour, which predominantly reflects the government-opposition conflict and occasionally the left-right axis. The pattern of opposition in the Slovenian parliament is also addressed and reveals a co-operative and competitive pattern of parliamentary opposition. The main features of parliamentary activities are the high levels of cohesion of all deputy groups, mainly government and undersized party groups. In addition, agreement levels are high for the government and, surprisingly, also for the chamber as a group. Finally, the research results are revisited in an international context which provides glimpses of a path forward involving further investigations sharing a common methodological basis.