Teacher quality is the most important school level factor affecting student achievement. There is a direct correlation between effective instruction provided by highly qualified teachers and increased student achievement (Colvin & Johnson, 2007).
Starrett, Teresa Martin
"Principal Perceptions of Walkthrough Effectiveness,"
School Leadership Review: Vol. 10
, Article 6.
Available at: https://scholarworks.sfasu.edu/slr/vol10/iss1/6
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