As both of these facets are only weakly correlated with Big Five Agreeableness, Ashton and Lee suggest dividing NEO PI Agreeableness into two factors similar to those in the HEXACO Model: Honesty-Humility (i.e., Straightforwardness and Modesty) and a redefined Agreeableness (Trust, Altruism, Compliance, and Tender-Mindedness). Reflecting this conception of Honesty-Humility and HEXACO Agreeableness as unique though similar concepts, Ashton and Lee propose that they represent different aspects of reciprocal altruism: fairness (Honesty-Humility) and tolerance (Agreeableness).
As both of these aspects are only weakly associated with Big Five Agreeableness, Ashton and Lee propose dividing NEO PI Agreeableness into two factors akin to those in the HEXACO Model: Honesty-Humility (i.e., Straightforwardness and Modesty) and a redefined Agreeableness (Trust, Altruism, Compliance, and Tender-Mindedness). Reflecting this conception of Honesty-Humility and HEXACO Agreeableness as unique yet related concepts, Ashton and Lee suggest they represent different facets of reciprocal altruism: fairness (Honesty-Humility) and tolerance (Agreeableness).