In the fourth episode of the series “Theory in about 1 minute,” the concept of dialogue is presented by Alistair Clark (audio only).
Theory in about 1 minute is a series of podcasts/videocasts recorded in three languages (Brazilian Portuguese, French, and English) presenting basic theoretical concepts for studies in language acquisition in accessible language. The texts cover topics such as bilingualism, subjectivity, alterity, language, speech genres, mother tongue, literacies, early literacy, and many others. The series is an initiative of the Research Group on Language Acquisition at Unesp/Araraquara (GEALin) in Brazil.
This podcast would make a good classroom resource for teaching about dialogue. See also KC14: Dialogue, and KC1: Intercultural Dialogue, as well as other Key Concepts in Intercultural Dialogue produced by this Center.