 One distinction is between epistemic conflicts and ontological conflicts. (For different terminology, see Blackburn 1996, 127–128.) The former involve conflicts between two (or more) moral requirements and the agent does not know which of the conflicting requirements takes precedence in her situation. Everyone concedes that there can be situations where one requirement does take priority over the other with which it conflicts, though at the time action is called for it is difficult for the agent to tell which requirement prevails. The latter are conflicts between two (or more) moral requirements, and neither is overridden. This is not simply because the agent does not know which requirement is stronger; neither is. Genuine moral dilemmas, if there are any, are ontological. Both opponents and supporters of dilemmas acknowledge that there are epistemic conflicts.