Colorado's teacher evaluation system has added a lot of work for principals without adding any additional resources. 

The 2010 law requires that principals observe all their teachers multiple times, provide them with meaningful instructional feedback and assess their professional practices — all while still doing the rest of their jobs. The demands of the law have frustrated many administrators, leading Curtis Garcia to resign as principal of the K-12 school in tiny Centennial School District in San Luis, the Denver Post reported.

"I felt at the time I was not only unable to focus on the instructional leadership that I owed the teachers, but I was trying to do it across the span of every single grade level — that's unique to schools our size," he told the paper. "It started to feel impossible to devote the time and attention that teachers deserve."

Garcia ultimately withdrew his resignation, but he remains concerned about the demands created by the law.

Districts are able to create their own system or use one supplied by the state, but the full evaluation program must be in place by 2015 to be in compliance with the law.

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