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In order to meet the mission needs of today and keep up with the pace of technological advances, adapting the Enterprise Systems Engineering (ESE) process in a time constrained mission-centric environment is critical to leverage the efficient delivery of new capabilities in a Net Centric environment. Agility (contemporary) versus rigidity (traditional) are approaches that have their trade-offs but to meet the demands and needs of our war-fighters, we must have an ESE process that allows us to deliver quality capabilities to the tactical edge. Governance plays a significant role and testing services needs to be addressed different from the traditional T&E of stovepiped systems. The traditional approach of building systems to deliver a specific function is being changed to an approach of architecting services. ESE utilizes defined processes that use managerial and technical tools to analyze problems and provide structure to the overall process of planning, procuring, designing, implementing and testing an enterprise system. Adding agility and assurance to the traditional and ESE is the process by which we build quality into complex systems while delivering functionality and security of contents in a manageable timeframe and stay flexible to meet emerging requirements. This study is based on architecting the GIG which is the ultimate complex system. Utilizing the DoD's framework to facilitate information sharing; which starts with data discovery and access, we analyzed several concepts to achieve agility and higher level of security in Information Sharing Systems. The concept of the GIG also ensures that systems are not only robust but also incorporate the flexibility needed to satisfy needs that evolve during the system's life.