Similar to Ryan, I have used a number of strategies depending on the data available and the needs of the client. Things to take into account include:
- Priority
- Severity
- VIP Flag
- Service Type
- Incident vs. Request, etc.
However, this is also dependent on what costs you are allocating through the Tickets object.
Service Desk. If you are allocating service desk costs, that are simply a triage service, then you may want allocate these costs evenly across all tickets.
Desktop Support. If you wish to allocate desktop support costs, and have enough data in tickets, you could allocate all desktop support related tickets, and use a combination of priority, severity, and VIP to weight those costs
Application Support. Sometime I've seen customers allocate Application Support costs (when they don't have Time Tracking data to do the same thing) using Tickets and in a similar way to Desktop Support
Michael