IBM Systems Application Architecture

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Systems Application Architecture (SAA) is a set of standards for computer software, developed by IBM in the 1980s and implemented in IBM operating systems including OS/2. The purpose of the standards was to enable the development of interoperable software on different platforms and operating systems. The most important of the standards are:

• Common Programming Interface (CPI)
• Common User Access (CUA)
• Common Communication Support (CCS)

Of these, only the CUA, which standardizes parts of the user interface, remains influential.