Design
APAS was designed by Vladimir Syromyatnikov of the Moscow-based RSC Energia and has roots in the Apollo-Soyuz program. The idea behind the design is that unlike with the probe-and-drogue docking system, any APAS docking ring can mate with any other APAS docking ring, both sides are androgynous. In each docking there is however, an active and a passive side, but both sides can fulfill either role. There are 3 basic variations of the APAS system.
Read more about this topic: Androgynous Peripheral Attach System
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