[caption id="attachment_121488" align="alignleft" width="150"] To prepare for the rigor of Common Core testing, school districts must engage teachers in sustained, in-depth professional development.[/caption]

To prepare for more rigorous assessments aligned with the Common Core standards, teachers will need more time and opportunities to collaborate with each other, education professor Linda Darling-Hammond told superintendents at the American Association of School Administrators’ National Conference on Education Feb. 22.

But she also warned that using value-added models to rank and evaluate teachers—a practice that is spreading among school...

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