A teacher implements a scientifically based instructional reading strategy for the first time with a class. The teacher then assesses students' learning but does not see the desired results. Which of the following is most important for the teacher to consider before using the strategy again?

A. Students' learning levels differ, and the assessment results may not be valid for all the students in the

class.

B. Some students participating in the lesson may not have liked the content of the lesson, and so they may

not have scored as well on the assessment as they would have for different subject matter.

C. Students must be exposed to the strategy over time by a teacher who is using the strategy faithfully as

designed before seeing improved learning results.

D. Students were unfamiliar with the assessment format and so scored poorly.

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