Finding out the Object Types involved

If I want to develop a workflow for particular scenario , then how should I know the object type used for that scenario?

Is there any standard method to find out the object type involved in the perticular scenario?

Or what can be the work-around ?

Many times the proper object type is not available , so I have to create the object type on my own and assign the events.

Switch the event trace ON (Tcode SWELS), carry out your transaction and view the event log (Tcode SWEL). If there is a standard event then the trace will tell you the name of the object and the event raised. Otherwise create your own object and events and trigger it (them) using FM "SWE_EVENT_CREATE".