This folklore can include jokes, sayings and expected behavior in multiple variants, always transmitted in an informal manner. For the most part it will be learned by observation, imitation, repetition or correction by other group members. This informal knowledge is used to confirm and re-inforce the identity of the group. It can be used both internally within the group to express their common identity, for example in an initiation ceremony for new members. Or it can be used externally to differentiate the group from outsiders, like a folkdance demonstration at a community festival. Significant to folklorists here is that there are two opposing but equally valid ways to use this in the study of a group: you can start with an identified group in order to explore its folklore, or you can identify folklore items and use them to identify the social group.