This course provides an introduction to theories and research that support a rich understanding of oral language development and the multiple important roles that oral language plays in providing a foundation for learning to read and write. We will investigate the development of the major domains of oral language (phonology, vocabulary, grammar, and extended discourse) from birth through adolescence, and we will explore oral language development for both monolingual English speakers and children who are learning English as a second language. We will also explore how this deep understanding of oral language development can inform educators" practical decision-making about language instruction.