Catalyst reports that the teacher evaluation ratings for the public schools contained errors.

“Citing a computer coding error, district officials have acknowledged that they miscalculated last year’s REACH performance task scores for one out of every five educators.

“Only a tiny fraction of the 4,574 errors were significant enough to result in ratings changes, however. A total of 166 teachers were given corrected ratings earlier this year, and most moved up a category, CPS officials say. Teachers whose ratings dropped won’t be penalized.

“The coding error involved matching student rosters with scores on performance tasks, the subject- and grade-specific assessments that were developed by committees of CPS teachers.

“Though the problem was not extensive, the number of mistakes – and the possibility that there are still others – has renewed criticisms about the use of such a complex system to evaluate educators and put jobs on the line.”