Interoperability is becoming an area with high focus both at national and cross-national level. This paper presents an assessment of the maturity levels of cross-national interoperability activities within the governmental domain in 13 nations. This analysis includes an assessment of national enterprise architecture programs and national interoperability collaborations, in order to find out whether these serve as important precursors for engaging in cross-national interoperability collaborations. This paper document the importance of national activities as a precursor for engaging in cross-national interoperability collaboration by demonstrating the relation between the maturity of national and cross-national activities.