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SNA

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ALSO CALLED: Systems Network Architecture, IBM SNA, System Network Architecture
DEFINITION: Systems Application Architecture (SAA) was IBM's strategy for enterprise computing in the late 1980s and early 1990s. It was replaced and considerably expanded by IBM's Open Blueprint , an enterprise strategy for network computing. Both of these are structured views of the types of computing services that an enterprise may need, the relationships between these services, and specification of the standards  … 
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SNA DEFINITION (continued): …  and products that are envisioned as providing these services.SAA defined three layers of service:Common User AccessCommon Programming InterfaceCommon Communications SupportBy using or creating applications and data that conformed to these three layers (provided by strategic IBM products), an enterprise could be assured of consistency and some amount of program portability among IBM's range of computer systems. As IBM, along with the rest of the computer industry, discovered the value of industry-wide standardization and open computing, the company revised its strategy. Its new strategy, the Open … 
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