If someone says that a particular teaching practice doesn’t work (sharing observations, or research), and your assessments indicate otherwise, there are 2 possibilities:

1. The other person didn’t have your data set, making a premature claim.
2. Your assessments are invalid.

While the former certainly occurs, the latter is more prevalent. For example, teachers typically announce tests on X ahead of time, teach X, then test X. Then, the tendency is to draw the conclusion that students know X, or do X well. This is almost never true. An assessment such as this can only show one thing for certain; who studied X for the test…

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