Symptoms
I have created a K2 workflow in a SP site. Added a group having 2 users as participant / destination and selected "one at a time" option. What should be the expected behaviour when the process is triggered ? Should not it be like , User 1 gets the worklist item / task . He / she then completes it and only then second user in the group gets the task. Once the second user completes only then the particular user task is complete and then the workflow moves further. But this is not happening . Only the first user gets the task and on completion , the user task finishes and workflow moves further. I guess this should not be happening.
Diagnoses
The behavior described is correct for that part of a SP2013 K2 Designer workflow wizard. Selecting "one at a time" means only the first user gets the task and on completion, the user task finishes and workflow moves further.
Resolution
In order to have all users in a group complete a task, it can be done by adding conditions in the Outcome Rules like "All participants selected "Approve" condition where Approve is one of the Outcome. This allows the task to be assigned to the 2nd user once the 1st has completed it and so on.
