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The Diet Cola Test was designed as a process assessment of science aptitude. Investigations of the instrument's reliability and validity for that purpose led to the conclusion that the data did not support the use of the instrument for making decisions about aptitude for individual students. Although the instrument was not suited for decision making for the purpose of identification, examination of the reliability and the item content, and further investigation of the validity suggested that it might be a suitable instrument for assessing science process skills as part of program or curricular evaluation.
Adams et al. (Sun,) studied this question.