Most organizations depend on the effective integration of a number of systems in order to quickly adapt to changes of all types, such as changing technology, changing customers and customer needs, and changing business partners. To accomplish this, an organization's systems must form an enterprise architecture that is in effect a system of systems (SOS) or systems family. The perspectives of all the stakeholders, from the chief executive to the technology developer to various implementation contractors, must be considered in developing the architecture. The systems that constitute the system family must be evolvable and adaptive in order to enhance the ability of the organization to cope with emerging needs.