* Re "Wage Incentives for Teachers Will Not Pay Off in the Worst Schools," Commentary, Aug. 21: I am an experienced teacher in a low-performing school. The only way I can qualify for any bonus is based on the school meeting its Academic Performance Index target. It doesn't matter that nearly half the teachers at my school are teaching with emergency credentials. It doesn't matter that I personally have no control over teacher absenteeism. It doesn't matter that I have no control over any other classroom but my own. And even that doesn't when it comes time to handing out student-performance bonuses.