The document discusses theories of language development including behaviorist, innatist, and interactionist views. It describes the stages of early language development from one word to multi-word stages. The components of language including phonology, semantics, syntax, and pragmatics are examined. Guidelines for supporting bi-lingualism, second language teaching, and literacy development are provided. The importance of child-directed speech, emergent literacy, and creating a print-rich environment are emphasized.