 Some objections to the consistency norm are closely related to the considerations of  Excessive Demands.  And even in cases where it would be within our powers to discover an inconsistency given our resources of computational power, time and so on, it may still be reasonable to prioritize other cognitive aims rather than expending significant resources to resolve a minor inconsistency (Harman 1986). However, many authors who invoke  (CN)  do so in a highly idealized context. They think of the norm not as reason-giving or as a basis for attributing blame, but merely as an evaluative norm: an agent with an inconsistent belief set is less than perfectly  rational.[22] 