This memorandum transmits guidance to Federal agencies on the development and implementation of Information Technology Architectures. The Information Technology Architecture (ITA) describes the relationships among the work the agency does, the information the agency uses, and the information technology that the agency needs. It includes standards that guide the design of new systems. An ITA makes it easier to share information internally (e.g., agency-wide e-mail) and to reduce the number of information systems that perform similar functions. The ITA provides the technology vision to guide resource decisions that reduce costs and improve mission performance.