Is is possible to have multiple users in an activity diagram

Question

I want to ask that two different users are using the same system and the system depends on both of the users.Will there be a single activity diagram for both the user or will there be two activity diagram each including single user. If both then how?? Thanks in advance

Answer 1

You do that simply by adding ActivityPartitions like this:

The partitions are instances of/typed with the actors.

p. 418 of the recent UML 2.5.1 specs:

15.7.7 ActivityPartition [Class]

An ActivityPartition is a kind of ActivityGroup for identifying ActivityNodes that have some characteristic in common.