  One response to these challenges is to observe that the Fregean argument was developed above without any use of the term ‘ontological commitment’. Any challenge to the definition of ‘ontological commitment’ provided by Quine’s Criterion therefore appears irrelevant to the version of the Fregean argument developed above. However, this response is unlikely to satisfy the challengers, who will respond that the conclusion of the argument developed above is too weak to have its intended effect. Recall that the conclusion, Existence, is formalized in our philosophical meta-language LP as ‘∃xMx’. So this formalization will fail to have its intended effect unless this meta-language sentence is of the sort that incurs ontological commitment. But that is precisely what the challengers dispute. This controversy cannot be pursued further here. For now, we simply observe that the challengers need to provide an account of why their non-standard notion of ontological commitment is better and theoretically more interesting than the standard Quinean notion.