By default, when creating multiple workflow tasks, they run sequentially. How can workflow tasks that do not depend on each other be allowed to run concurrently?
Normally, multiple workflow tasks on a change order will run sequentially, in order of sequence number, the lowest numbered task first. If this behavior is not desired, tasks can be run in parallel through the use of the special markers Group Start Task and Group End Task. For example, suppose tasks 10 through 40 are defined, as follows:
10 Task Ten 20 Task Twenty 30 Task Thirty 40 Task Forty
To make tasks 20 and 30 run simultaneously, insert Group Start Task and Group End Task, as follows:
10 Task Ten 15 Group Start Task 20 Task Twenty 30 Task Thirty 35 Group End Task 40 Task Forty
For this reason, it is advisable to choose sequence numbers spaced apart sufficiently so that such changes can be accommodated later.