Furthermore satisfaction within a given domain could conceivably be a consequence of SWB. For example, Heady et al. (1991) have argued that satisfaction with work, standard of living, and leisure satisfaction, are largely the result of overall life satisfaction, and that satisfaction with friendship and general fitness (as opposed to illness) appear to be explicable solely on the basis of personality; on the other hand satisfaction with marriage appeared to both influence and be influenced by overall SWB.