Most of Minnesota’s school districts are ready to implement new teacher evaluations this fall. But it’s unclear if all 333 districts will meet the deadline because some are still developing plans. Lawmakers revamped Minnesota’s teacher evaluation law in 2011 to overhaul the old system, in which some teachers went a decade or longer without receiving proper feedback. Under the new law, new teachers will be given formal evaluations each year for three years. The state teachers union Education Minnesota says that about a quarter of schools in the state are still working on plans. The Minnesota Department of Education, the state teachers union and the Minnesota Association of School Administrators are helping districts.