 Besides truth norms like  (\(\NB_1)\)  and \((\NB_2)\) above, two further kinds of candidate norms of belief have been discussed: knowledge norms, and norms of rationality, justification, or  inference.[54]  CD normativism then is the claim that beliefs cannot have content unless rules or norms of at least one of these kinds are in force for them. Strong versions of CD normativism hold that CD norms also determine which contents beliefs have. And again, being in force can roughly be interpreted in three ways: As requiring the subject to follow the relevant rule or norm \(R\), to accept \(R\) in a sense not requiring (general) following, or as independent of the subject’s attitudes and intentional states towards \(R\) (see above,  section 2.2.1).