Best Practices is a response to the recent paradigm shift in the field of language acquisition. The book launches the field of communication sciences and disorders by identifying major shortcomings in the traditional field of speech and hearing sciences. Best Practices is based on developments in scholarly literature. In order to define and elucidate best practices it pinpoints numerous issues that have been missed or ignored in the contemporary clinical published writings. It addresses levels of scholarship, rational evidence as the precursor of empirical evidence, and influential theoretical perspectives. The book also examines substantive differences between pre-grammatical and grammatical children, the limitations of normative tests, and intervention principles for various clinical populations. Best Practices is ideally suited to classes in language acquisition, language intervention, and language assessment. Best Practices is a companion text to the book Language Acquisition, which uses influential theories to address critical issues often overlooked or ignored in standard textbooks in the field.