D.C. Public Schools Chancellor Michelle Rhee confirmed Friday that 302 school staff members, including 241 teachers, will not return to the classroom next year because of ineffective performance.

About 740 teachers and staff members were rated as “minimally effective” under the system’s new Impact evaluation tool, used for the first time in 2009-10. Those employees will not receive expected “step” increases — pay raises based on years on the job. In addition, if they don’t improve their rating by next year, they’ll be out of a job, too.