Final answer:
A 1-5 grading system by principals and master teachers can be a valuable part of a feedback control system for teachers as it provides a standardized and objective way to evaluate performance and provide actionable feedback.
Step-by-step explanation:
A 1-5 grading system by principals and master teachers can be a valuable part of a feedback control system for teachers. This system provides a clear and standardized way for evaluating a teacher's performance based on specific criteria. The use of a numerical scale allows for objective assessment and comparison of teacher performance, helping to identify areas of strength and areas for improvement. It also provides teachers with actionable feedback that can be used to refine their teaching strategies and enhance student learning outcomes.