We can divide coherentist theories into two types: positive and negative.  The positive coherentist will claim that a memory belief is justified if it possesses a sufficiently strong coherence relation with one's system of belief.  This is “positive” coherence because such coherence demands more than an absence of doxastic conflict. For a belief to positively cohere it must in some way be supported or made probable by the doxastic system with which it coheres.  (BonJour 1985 never discusses the epistemology of memory in particular, but the view he presents there entails a positive coherentist account; and in BonJour 2002, pp. 183-184, he gives a positive coherentist account of memory justification and explicitly rejects the foundationalism he accepts in other epistemic domains.) The negative coherentist, on the other hand, will insist only that there be an absence of conflict with the belief system in order for the memory belief to be justified. In effect, the negative coherence theory and the simple version of foundationalism are just the same: each claims that in the absence of defeat, memory beliefs are justified. (For a defense of negative coherentism see Harman 1986 and McGrath 2007; for a critical discussion see Senor 1995.)