So who is doing the evaluating? It depends on your own situation and resources, but for the richest model we recommend administrators, department heads, and then the teachers themselves. Student surveys can add another important gauge to the overall success a teacher is having in the classroom.
After each of the evaluators has scored their teachers, they meet as a team to compare, discuss, and come to a consensus and final score for each teacher. This approach provides checks-and-balances to limit any bias or prejudice in the final outcome and brings the heart and personal consideration to the evaluation. Traditionally, the last phase of the process is a written narrative about the teacher that brings all pieces together and provides a final determination of where that teacher is both professionally and how they should be compensated.