Does anybody knows any strict criteria for bilingualism or scale which I could use in order to assess who is bilingual? I need some tool that does not assess some particular language fluency with the use of language proficiency test.

I know only one which is close to what I am looking for - Bilingual Dominance Scale, but it puts emphasis on dominance - so the comparison between two languages. I do not want to compare these two but try to assess it somehow separately - without getting into the assessment with use of language tests.

I would be grateful for any help!

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