In the early 1990s, a separate but very similar effort was started by an industry consortium, the Common Open Software Environment (COSE) initiative, which eventually became the Single UNIX Specification (SUS) administered by The Open Group.
Počátkem 90. let započalo samostatnou, ale velice podobnou, snahu průmyslové konzorcium, iniciativa Common Open Software Environment (COSE), která vyústila ve specifikaci Single UNIX Specification spravovanou skupinou The Open Group.