Use of grouping activities in TIBCO

What is use of grouping activity in TIBCO ?

Grouping activities are used for:

1. To Generate a set of activities having a common error transition.
2. Replicate group of activities based on a condition.
   1. - Iterate over a list.
   2. - Iterate until condition true.
   3. - Iterate on Error until condition true.
3. Group activities into a transaction.
4. To create a critical section area that synchronizes process instances.
5. A 'Pick First Group' permits you to wait for the occurrence of multiple events and proceed along a path following the first event to occur.

Below details from TIBCO helps to understand the usage of Pick First Group -

                     

Pick first groups allow process execution to wait for one or more events.

The first event that completes determines which transition to take to continue processing.

For example, as part of an order-entry system, when an order is placed, a check is made to see if the order can be filled from stocked inventory or from returned merchandise. Whichever system returns the information first is used to fill the order. If neither system returns the information about available inventory, the order times out and cancels.