Hi Perry--Thanks for reminding me about this.  I had taken a look at this previously and my feeling was stpipe was at a higher level than what we want to be developing for ccdproc.    I believe we are going to follow something closer to @eteq suggestion of updating the meta-data with logging information and leave recording of the processing in a different format up to the user as everyone will have slightly different needs and preferences.    It would be my hope that ccdproc would be able to be integrated into something like stpipe if ccdproc does prove useful and my hope is that how we are setting things up wouldn't prevent that from happening.