In our increasingly digitized economy, information technology (IT) has become fundamental to support, sustain and grow organizations. Successful organizations leverage the digital innovation potential but also understand and manage the risks and constraints of technology. Previously, the governing non-executive board could delegate, ignore or avoid IT related decisions, but the disruptive new technologies (cloud, internet of things, big data…) are increasingly being felt at board level. Emerging research calls for more board level engagement in enterprise governance of IT and identifies serious consequences for digitized organizations in case the board is not involved. Yet, it appears that enterprise technology governance competence remains the 'elephant in the boardroom' for more than 80% of boards of directors. Starting from this problem statement, this PhD research focuses on the "why", "what" and "how" of board-level decision making in IT related matters.