Electronic services have become a critical force in service oriented economies introducing new paradigms like connected governance, ubiquitous and ambient public services, knowledge-based administration, and participatory budgeting. The success of e-Government integration requires the modernization of current governmental processes and services under three different perspectives, namely governmental business processes reengineering, legal framework reformation and technical solution effectiveness. The study proposes a knowledge guide for approaching, analyzing and defining government-wide architectural practices when building large scale enterprise governmental frameworks. A set of fundamental design and implementation principles are specified for increasing government organizations’ agility and ensuring that end-users perceive the quality of the provided services.