Bartholomew and Horowitz have proposed that working models consist of two parts. One part deals with thoughts about the self and the other deals with thoughts about others. They further propose that a person's thoughts about themselves are either generally positive or generally negative. The same applies to a person's thoughts about others. In order to test these proposals, Bartholomew and Horowitz have looked at the relationship between attachment styles, self-esteem, and sociability. The diagram below shows the relationships they observed: