This lesson focuses upon the requirement that an adverse possession claim must be based upon possession that is sufficiently "hostile" and "under claim of right." This lesson addresses the following topics: the rationale behind the "hostile/under claim of right" requirement and how it relates to the other elements of the common law adverse possession rule; the significance of "permission to occupy land" under adverse possession doctrine, and how to distinguish between permissive and hostile claims; and the legal standards by which differing courts have evaluated the hostility of a possessor’s claim, either by reference to the possessor’s actions (objectively), or state of mind (subjectively).