 Let’s call this broad way to challenge the inductive credentials of the pessimistic argument ‘the Privilege-for-current-theories strategy’. This has been adopted by Michael Devitt (2007) too, though restricted to entities. Devitt, who takes realism to be a position concerning the existence of unobservables, noted that the right question to ask is this: ‘What is the “success ratio” of past theories?’, where the “success ratio” is “the ratio of the determinately existents to the determinately nonexistents + indeterminates”. Asserting a privilege for current science, he claims that “we are now much better at finding out about unobservables”. According to him, then, it is “fairly indubitable” that the historical record shows “improvement over time in our success ratio for unobservables’.