An administration server of an administration service assigns attributes to objects by a plug-in of the administration service. The plug-in implements a method of a functionality set and the method is callable by the administration service to perform the assigning. Additionally or alternatively, the administration server triggers a reconciliation event by changing the assignment of an attribute of the users that comprise objects of plug-ins; determines a scope of the users and which objects are affected by changing the assignment; and reconciles conflicting assignments. Additionally or alternatively, the administration server adds tasks by the plug-ins to a job created by the plug-ins with the tasks performing the assigning; and removes tasks from the job to optimize it.