Abstract: A system may include reception of an indication of a user interface event, determination of an instruction to assign a person to a task based on the user interface event, calling of a service of a user interface controller object to assign the person to the task based on the determined instruction, calling of a service of a business object associated with the task to assign the person to the task, update of the business object to assign the person to the task, synchronization of the user interface controller object with the updated business object, and generation of a user interface to present a Gantt chart representing the updated business object.