priority calculation for bugs

This was the method I used in a past life, and found it very helpful for prioritizing bugs:

Priority = 6 - Severity + Frequency + Workaround + Customer Request

Severity = 2 High
1 Low (Enhancements and low severity issues)

Frequency = 2 High (happens all the time)
1 Low

Workaround = 0 None
-2 There is an easy workaround
-1 There is a hard workaround

Customer Request = 1 Customer found the problem
0 SQA (internal) found the issue

So know, Priority 1 = Critical
Priority 2 = High
Priority 3 = Normal
Priority 4 = Low
Priority 5 = Very low
Priority 6 = Detail