 With respect to the normative question of which of the previously stated rules we ought to rely on (if we ought to rely on any form of abduction), where philosophical argumentation should be able to help, the situation is hardly any better. In view of the argument of the bad lot, ABD1 does not look very good. Other arguments against abduction are claimed to be independent of the exact explication of the rule; below, these arguments will be found wanting. On the other hand, arguments that have been given in favor of abduction—some of which will also be discussed below—do not discern between specific versions. So, supposing people do indeed commonly rely on abduction, it must be considered an open question as to which version(s) of abduction they rely on. Equally, supposing it is rational for people to rely on abduction, it must be considered an open question as to which version, or perhaps versions, of abduction they ought to, or are at least permitted to, rely on.