as a result teachers may perform at a level lower than expected at the concerned career stage for a number of years while it is a strength of the system that processes exist to move ineffective teachers either out of the school system or into nonteaching roles there remain opportunities for underperforming teachers to remain in the system for long periods of time if sustained underperformance by teachers is not tackled this has adverse consequences not only on student learning but also on the reputation of both schools and the teaching profession