Parliaments qualify as complex organizations and professional bureaucracies. Support staff units are used by the legislature to buffer it from outside influences which it seeks to avoid or control. There are different models of parliamentary administration because of different models of parliament. Parliaments select a strategy and then tailor the structure to fit. Mixed models may emerge over time. Within parliamentary administration governance is based on the relationship between political apex and administrative top. Theoretical perspectives on organizational governance based on contingency frameworks (stewardship, agency, stakeholder and resource dependence theories) can not be separately considered. Each theory identifies different and specific roles that board may play but does not seem to perceive the whole picture of corporate governance. Innovation in roles and mechanisms of governance may be considered according to historic perspective. Boards may play different roles of governance as models of parliament (decisional/ratifying) combine with different models of support staff (consulting/registration) over time.