Undertaking the transition to Ada today will to most of us not mean using a full APSE, (DOD80, BUX80), tailored for this purpose. Instead, this transition must be made by using an existing environment, incrementally integrating its proven tools and concepts in the realm of Ada. This paper describes one effort taking this approach, where the UNIX revision control tool RCS, (TIC85), is integrated with an Ada program library, using UNIX style library interface.