What theories do exist that predict compatibility between two people? Sometimes I talk to people and I think there is just no connection. Or they are just too boring. I recently read something about transaction analysis. It's not quite communication theory, but it seemed to sort of grasp why with some people one doesn't get the response that one likes. Any other theories that might predict compatibility between two people in their personalities and communication styles? Roughly speaking the Big Five model and studies about compatible traits do the job. I once heard something about socionics. Anything else?