I always require the "Supporting Evidence"
for any claims made on an 8D from our suppliers. Even though I work in a "non-critical" industry - Audio, I fall back on my training in the Automotive Industry (Brakes and Suspension) and require more documentation than the flowery descriptions and "yes-men" verbage used on most 8D submissions.
I also provide more documentation to start the 8D process. Pictures, Defect Rates, Dates and Reports on lots inspected, etc. The better the supplier's starting information the quicker and more thoroughly they can reslove the issue.
Watch out for the "Prevent Reoccurance" and "Verify Controls" disciplines. These are the most often "lacking" in my experience. Suppliers usually don't understand what is expected here and often are limited in what they CAN provide based on the alloted response time (most people issuing 8D or Corrective Action Requests do not allow enough time for suppliers running batch operations to run multiple follow-up batches that can provide verification of controls and prevention of reoccurance).
Rule of thumb on 8D, 7-step, or Corrective Action Requests/Responses...
WHEN IN DOUBT, DOCUMENT IT!
If you feel your customer will not understand your one line answer on the 8D, explain it with data/additional detail attached. Flip side, if you aren't comfortable with an answer, ask for further data/detail.
Automated CAR/8D System?! Haven't really seen one that works yet!
These types of systems are HUMAN DISCOVERY Systems. You can't "automate" the act of discovery (or invention). You can set up Automated Archival Processes for the ensuing data, and in doing so set up a system for archiving that doesn't allow for "closure" until all fields (including space for additional data for each discipline) are filled. Even better, once you have this archive in place, suggest they work on a "lessons learned" database that allows for search of previous issues and resolutions when dealing with new issues or during the design process. This is the ultimate use for 8D/CAR/7-Step Data!
Hope this helps.