The quest to nail down a viable concept of truthlikeness is motivated, at least in part, by fallibilism (§1.1). It is certainly true that a viable notion of distance from the truth renders progress in an inquiry through a succession of false theories at least possible. It is also true that if there is no such viable notion, then truth can be retained as the goal of inquiry only at the cost of making partial progress towards it virtually impossible. But does the mere possibility of making progres