Standardized tests used to measure students' performance -- and increasingly to evaluate teachers -- do not capture the nuances of teaching, writes Lorraine Bellon Cella, superintendent of the Edgewater, N.J., school district. In this commentary, she writes about her childhood experience with a teacher who changed students' lives and wondered whether the confines of a standardized test could reflect her beloved teacher's investment in his students, willingness to be creative and ability to challenge them.

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