 To develop references in discourse, speakers try to establish the mutual belief that all speakers understand the references to a criterion that is sufficient for the purpose of continuing the discourse.In a conversation between a physician and his patient, for example, the doctor may request, “Contract your deltoid,” making reference to a technical term that the patient may not know.If the patient doesn't know, he will ask, “My deltoid?” and the doctor will clarify, “Raise your right arm.” If the patient does know the reference, he will comply immediately.