Black and others have also moved beyond conflict and social control to develop explanations of ideas, predation, welfare, research, and other forms of social life. For example, Black's theory of ideas explains the content of ideas with their social structures. Just as each conflict has a social structure that consists of the social characteristics of the disputants and third parties, every idea—every statement about reality—has a social structure consisting of the characteristics of the source, subject, and audience. For example, the subject of an idea may be intimate or distant from the source: People have ideas about family members and friends as well as strangers. The subject may also be high or low in social status: People have ideas about senators and businessmen as well as skid row vagrants. But ideas vary depending on their social structures. Black's explanation of voluntarism and determinism, for example, states that ideas about high status subjects are more likely to be voluntaristic (to invoke free will). The theory would predict, then, that people would offer voluntaristic explanations of senators and businessmen and deterministic explanations of skid row vagrants.