The Austin Common Standards Revision Group (CSRG) is a joint technical working group established to develop and maintain the core open systems interfaces that are the POSIX® 1003.1 (and former 1003.2) standards, ISO/IEC 9945 parts 1 to 4, and the core of the Single UNIX Specification, Version 3. The approach to specification development is "write once, adopt everywhere", with the deliverables being a set of specifications that carry the IEEE POSIX designation, The Open Group's Technical Standard designation, and the ISO/IEC designation. The current set of specifications is simultaneously ISO/IEC 9945, IEEE Std 1003.1 and forms the core of the Single UNIX Specification Version 3 . This unique development combines industry led efforts and the formal standardization activities into a single initiative, and includes a wide spectrum of participants. The group is free and open to participate in and features a balanced set of interest groups including commercial companies, influential figures from the open source community, liaisons from other standards groups, educational and government users, and user groups.
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