For large enterprises, IT governance is a major lever to influence the way how IT enables business. The authors hypothesizethat a part of IT governance, namely business-IT responsibility sharing and structural IT organization, has a strong influenceon IT architecture complexity of large enterprises. IT complexity is challenging CIOs of large enterprises all over the worldday-by-day. Yet, IT complexity so far has been analyzed by scientific research only to a small degree. To prove or falsify thehypothesis that IT governance influences IT architecture complexity, the authors developed concepts to measure both aspectswith a framework. In this research, the concept for business-IT responsibility sharing and its scientific background arepresented. The IT complexity measurement concept is shown, focusing on IT architecture complexity. An outlook for thisresearch, an empirical study that is currently in progress is given
