You can compare two Revisions of a Project to see the differences between them. Differences can be items that were added, deleted, or modified.
This displays all of the changes between the two Revisions. In the example above there are Removed and Added Items. A third possibility would be Adjusted if you say, modified the price of an Item between the two Revisions. You can filter to any of these Change Status via the Change Status section:
You can run reports via the Reports tab. You can run any report against this comparison data.
Note: If you upgraded from a previous version of SI, and you had customized Change Order reports, they will display under the "Client" Category.