I am working in the design of a survey to a national representative sample. The time in the pilot application is around 50 minutes. In the final of the questionnaire we are including the Raven's Test to measure Cognitive Skills. 

I have the doubt about the realiability of this measuring: the risk of measure cognitive skills with cognitive bias in the final of a large questionnaire. We can not change it to another part of the questionnaire, so my possition is drop the Raven's test, because it is not a main objective of the survey. What is your opinion? 

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