Editing Single UNIX Specification (section)

===1980s: Motivation===
The SUS emerged from multiple 1980s efforts to standardize [[operating system]] [[interface (computer science)|interface]]s for software designed for variants of the Unix operating system. The need for standardization arose because enterprises using computers wanted to be able to develop programs that could be used on the computer systems of different manufacturers without reimplementing the programs. Unix was selected as the basis for a standard system interface partly because it was manufacturer-neutral.

In 1984, the UNIX user group called /usr/group published the results of their standardization effort for programming interfaces in their 1984 /usr/group standard, which became basis for what would become the POSIX.1-1988 standard.<ref>{{cite web|url=https://kelty.org/or/papers/Kelty_WULP_Conceiving_2009.pdf|title=Conceiving Open Systems|first=Christopher M.|last=Kelty|website=kelty.org}}</ref><ref>{{cite book|url=https://docs.oracle.com/cd/E19641-01/802-1953/802-1953.pdf|title=Standards Conformance Guide|publisher=SunSoft|date=November 1995}}</ref>

In 1985, AT&T published [[System V Interface Definition]] (SVID), a specification of UNIX System V programming interfaces.<ref>{{cite book|url=https://books.google.com/books?id=QcG4wAEACAAJ|title=System V Interface Definition|date=1985|asin= B000KF6SCE}}</ref>