Task Dependencies

Is it possible to require that tasks be completed/resolved before the associated ticket can be closed? If we have multiple technicians assigned a task on a request, such as a new hire creation, then we really need to be assured that the tasks are completed before the primary ticket owner closes the request. If we cannot assure that the tasks are completed first, then the task feature proves to be worthless to us. It would also be great to be able to set reminders for tasks, like we do on SLA's. The way the system is set up now, tasks are out of sight out of mind for technicians. We need to make them mandatory and ensure that they are reminded to complete them, based on the established processes/rules.

Thanks.

-Mark