This report shows that the architecture of Big Banks' Management Control Systems can be presented as a two or three-tier structure without separating the functional components to the front and back office. The report also examines the key legislative and regulatory documents that define the specific requirements for the Big Banks' Management Control Systems' Software. Functional components' classification for banking management control systems' software is presented. Some of these components are considered in more detail. This paper also discusses some other categorizations of banking management control systems' functional components.