Lesson plans are busy work for teachers. Who writes out each step of what they will do each day. In the classroom each day builds on the previous days progress. Some days you accomplish more, some days less, some days you need to step back and remediate. I'm glad you said that. Lesson plans are part of the administrations supposed oversight.
In California even as a new teacher you only had to observations per year by your administrator.
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The biggest farce in education and a pressure relief valve for some teachers is to escape to administration for higher pay. I can't count how many very good teacher left teaching for the lure on more pay as mediocre administrators.
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In education there is no reason why administrators should be paid more than teachers. Education takes place in the classroom, not in an office isolated from kids.