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The paper "Evaluation of Colorado Learning Attitudes about Science Survey"[1] proposes a new, much shorter, version of the CLASS based on standard factoranalysis. In this comment we explain why we believe the analysis that is usedis inappropriate, and the proposed modified CLASS will be measuring somethingquite different, and less useful, than the original. The CLASS was based onextensive interviews with students and is intended to be a formativemeasurement of instruction that is probing a much more complex construct andwith different goals than what is handled with classic psychometrics. We arewriting this comment to reiterate the value of combining techniques ofcognitive science with statistical analyses as described in detail in Adams &Wieman, 2011 [2] when developing a test of expert-like thinking for use informative assessment. This type of approach is also called for by the NationalResearch Council in a recent report [3].

On the Proper Use of Statistical Analyses; a Comment on "Evaluation of Colorado Learning Attitudes about Science Survey" by Douglas et al