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Literacy in the United States
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I couldn't find a straightforward crosswalk between those scales, I think because they are measuring different things (skill in a second language vs pure literacy). It seems like all other things being equal (which they often are not), PIAAC level 1 might roughly be equivalent to CEFR level A2, seeing that both are defined to comprehending short paragraphs of simple sentences. Someone can correct me if I am (ironically) comprehending the scales incorrectly
I think you are comprehending them correctly, they are not equivalent. Comparing the descriptions of capabilities may be the closest we can get.