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As you compare and contrast the two terms, even educators tends to misuse them and label them as synonymous when they are not. They both offer solid data about students' skills and performances. However, they are quite different in scope.
First, assessments are much more continuous in nature and overall process-oriented, not grade or goal driven. Instead of just focusing on end results, such as a grade, they embraces "learning, teaching and outcomes" (http://web.duke.edu/arc/documents/The%20difference%20between%20assessment%20and%20evaluation.pdf).
Assessments are much more holistic, interactive processes between students and teachers, an exchange really, a give and take force. Assessments also ...
Ideas to prepare your students for high-stakes district, state, or national testing in the area of language arts/reading are articulated clearly.