"What criteria"

[Odessa Dawn]

What criteria should we use to determine whether a grammar book is reliable or not?

Don't we have limited choices here? Why not which, please? Thanks.

We usually use "which" when there are limited choices; we use "what" when there are unlimited choices.
https://www.usingenglish.com/forum/ask-teacher/201909-what-novel-you-reading.html

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[MikeNewYork]

Don't we have limited choices here? Why not which, please? Thanks.

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This issue exists, but it is not very important.

 

[Raymott]

I think it's important. 'What' is correct because there are no criteria identified yet. It hasn't been established yet whether the criteria are limited.
'Which' would be correct if you were given a list of criteria, only some of which we should use to determine reliability.

 

[5jj]

I think it's important. 'What' is correct because there are no criteria identified yet. It hasn't been established yet whether the criteria are limited.
'Which' would be correct if you were given a list of criteria, only some of which we should use to determine reliability.

I agree with Mike on this.

I also agree that the explanation you have given is correct. However, many, many native speakers do not observe this difference, at least in British English. I am always reluctant to insist that learners follow rules that native speakers don't.