Nina,
yep, we have Expediter a our disposal too. I rarely use it, since i do mostly batch work, and it's my opinion that Expediter doesn't add much when it comes to batch.
It takes quite a bit of pain to set up, especially when processing multiple files, so most of the time i use displays to zoom in on the problem when it occurs. However, for online programs, espcially those with no screen processing, it can be a very helpful tool.
For batch program debugging, we do use Abend-Aid a lot, which helps to form job output into well readable reports, supplies probable causes for most abends, and gives additional information to help solve a problem (detailed information on the files used, information to help locate a field in error - very useful for s(0C7)'s ! - etc).
Regards,
Ronald.