SI, I think your criticisms of ClearCase are entirely unfair and undeserved. It is entirely inaccurate to say that ClearCase has a "total lack of security". On Unix, it uses Unix security, which is pretty good. On Windows, it re-implements a Unix-like security model (owner/group/world). In my experience, this security model has proven inadequate... but is easily overcome by custom implementations based on triggers. You can hook the check-out event, and deny the check-out if your defined criteria are not met. (Ditto for check-in, and many other operations.) In this way, I have restricted access to various vob areas and file types based on individual user name, group membership, and other special-case criteria. I've disabled certain groups of users from moving labels; I've prevented anyone from moving certain labels backwards; etc. The possibilities are endless. Oh, yeah - it does require that you have a CC admin with a clue.