Custom Report to demonstrate ITs reponsiveness

We are attempting to compile a report that can be used to measure the responsiveness of our IT group.

We would like to measure the following:
Requester, Title, Description
Time request is created
The time required before the request is acknowledge by IT (initial response)
The time required before the request is assigned to a technician
The time before the request is closed

We have the ability to use Crystal Reports, but need some assistance in identifying the tables.

Has anyone constructed a report with similiar paramiters? Or implemented an equivilant solution?

Any assistance you could provide would be greatly appreciated.

Thank you

Trevor