This essay defends an account of what things are assessable for reasonableness and why. On this account, something is assessable for reasonableness if and only if and because it is the functional effect of critical reasoning.

In this paper, I develop and motivate a novel formulation of the safety condition in terms of etiological proper function. After testing this condition against the most pressing objections to safety-theoretic accounts of knowledge in the literature, my conclusion will be the following: once safety is suitably understood in terms of etiological proper function, it stands a better chance as the right anti-Gettier condition on knowledge.