Validity and Reliability both refer to how well a method is measured.
Validity refers to the whether the results really do represent what they are supposed to measure.
Reliability refers to whether the results can be reproduced under the same conditions.
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Government of Canada, S. C. Measuring Adult Literacy and Life Skills: New Frameworks for Assessment. Government of Canada, Statistics Canada. https://www150.statcan.gc.ca/n1/en/pub/89-552-m/89-552-m2005013-eng.pdf%3Fst%3DJBzir8Ag
Validity and Reliability
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