I'm helping collect the design considerations for **letting users see the version *number* of an item that was published to each Target Type in the Content Manager Explorer.**

So far we've covered:

 * **Show in GUI, per item.** We can show this information upon request. Maybe we can add it to `Where Used` helps, which has `publication targets` instead of `target types` but no version numbers (are those stored?).
 * **Non-editable data.** We'll store information in `Application Data` rather than metadata (authors shouldn't change). We wouldn't content port this since it's specific to a given CMS environment (in DTAP).
 * **Sync with Rollbacks.** We must handle rollbacks, especially with delete, either by adjusting values or storing entries (similar to Chris Summers' ["Save & Comment" PowerTools extension][1])
 * **Automation?** I'm not partial to where the automation happens, but Event System seems a better fit than storing this is Content Delivery.

I'm just not sure on scheduled publishing, especially in done in phases. I think authors would want **the version of the item as it was *rendered*, but we might also need to handle failed publishing transactions.**

Am I missing any scenarios or do you have any other recommendations for letting users see which version of an item was published where?

  [1]: https://code.google.com/p/tridion-2011-power-tools/wiki/ItemCommenting