The new appraisal guidelines have set up a renewed battle with the teacher's union United Teachers Los Angeles just weeks before the March 5 school board election.
Deasy calls the new evaluation guidelines vital when it comes to providing students with the highest quality teachers.
The union says it doesn't want to see the evaluation process set back by what it calls the superintendent's personal agenda.
The remaining 70 percent of the guidelines will comprise classroom observation and other factors, according to Deasy.
The Associated Press contributed to this report.