You may be interested in seeing the number of accounts that were called on for a specific period by a group.
For example, you might want to know how many A Grade account a Rep has in their territory and how many of them were called on last month. You may also want to see a list of accounts that were not called on to know which ones were missed.
These questions can easily be answered with 2 reports.
Reach Summary report
Report Viewer Click Path: Coverage > Summary > Reach Summary
Reach Detail report
Report Viewer Click Path: Coverage > Detail > Reach Detail