Steve Rachui's Manageability blog - ConfigMgr/OpsMgr : SCCM: Forcing a Task Sequence to Rerun
There are well known methods to force an advertisement to rerun – including several add-on tools available for the SMS or SCCM console. To date, however, there are not equivalent methods to force a task sequence to rerun. Part of this may be because task sequences are typically thought of as focused on Operating System Deployment (OSD) and rerunning these types of distributions are not as common as rerunning advertisements.
Steve Rachui's Manageability blog - ConfigMgr/OpsMgr : SCCM: Forcing a Task Sequence to Rerun