In the social sciences a social group has been defined as two or more humans who interact with one another, share similar characteristics and collectively have a sense of unity. Other theorists, however, are a wary of definitions which stress the importance of interdependence or objective similarity. Instead, for researchers in the social identity tradition "a group is defined in terms of those who identify themselves as members of the group". Regardless, social groups come in a myriad of sizes and varieties. For example, a society can be viewed as a large social group.