With approval of P1003.1 (the 1003.1 Revision) expected in 2001, the basis upon which the existing (1003.13-1998) and planned (P1003.13a, P1003.13b) profiles depended has changed, and all old and new APIs being profiled are to be found in what will likely become IEEE Std 1003.1-2001. There is substantial embedded/realtime-kernel industry experience with various non-standard variants of all the proposed profiles and their underlying interfaces. Multiple RTOS and RT/Embedded Linux vendors are now claiming compliance (if not conformance) to various 1003.13-1998 profiles. The purpose of 1003.13, and now of the 1003.13 Revision, is to unify this area. Note: The above purpose is semantically identical to the original purpose, except that the original list of IEEE 1003-series standards to be profiled has been replaced by their sole successor, 1003.1-2001, and the 1003.5-series standards (Ada bindings to POSIX) and P1003.26 (Device Control) have been added. These changes also have the effect of including the purpose of both P1003.13a and P1003.13b.