System integration and associated architecting is necessary as it bridges platforms and heterogeneous applications of operations (Giese 345). As such, this kind of architecture provides ties in which operating systems and business integration applications mix. The aim of this paper is to access the role of the of the integration of the system as well as the associated architecting in an effort to ensure the environment soundness of a system of systems and any associated design, integration principles and architecture. The paper will also access the notion of Lead System Integration concept and how it relates to integration in the family system (Giese 347). System integration and associated architecting are vital aspects of an enterprise since they allow flexibility within the enterprise system. For an architectural enterprise’s workflows to become accessible to data and functions, it is necessary that system integration architecture is utilized. The barriers existing in an enterprise tend to fall, or are in a continuous change, if unsubstantial system boundaries are taken into account. (Dias & Richardson 26). This is mostly brought about by growth of modularity in the system. Therefore, it is the responsibility of good system integration architecture together with the most suitable middle-ware to assist and ensure that this flexibility is provided (Sonde 56). Again, System integration and associated architecture is necessary in cases where data and functions must be used across the system and where middle ware must be incorporated to bring rapid developments. As such, an enterprise must use system integration and associated architecting in this context to ensure a long run sustainability and stability of an enterprise. Moreover, system integration is rendered vital when building costs and unique one-to-one integrations are taken into consideration. This is due to the rapid growth being experienced in the larger systems within the sector (Dieter, Mark & Florian 196). As such, there is a tremendous cost associated, and hence, it necessitates system integration to be applied substantially than just making use of a system that is primary in nature. Still, system integration and architecture plays an important role in that, when employed in the system of an architectural enterprise, architectural interfaces and underling principles tend to be reused. Consequently, components and skills that follow are less in number, and this makes them key elements in sustainability of the enterprise. System integration is also important in simplification of situations where, a decision must be agreed upon concerning the course of action, which needs to be taken to deliver the desired results (Dieter, Mark & Florian 198). As large amounts of data and work processes that have been differentiated are put into use across the system, a system integration architecture coupled with solutions brought about by middle-ware will therefore ensure that the integrity of the data across the entire architecture system is maintained and used effectively. In respect to horizontal systems, the efforts utilized tends to give an assurance that the evolutions are reliable, robust and secured. These efforts are mostly concentrated in the layers of system architectural services rather than made to distribute ove