The majority of children acquire language effortlessly but approximately 10% of all children find it difficult especially in the early or preschool years with consequences for many aspects of their subsequent development and experience: literacy, social skills, educational qualifications, mental health and employment. With contributions from an international team of researchers, this book is the first to draw together a series of new analyses of data related to children's language development, primarily from large-scale nationally representative population studies, and to bring a public health perspective to the field. The book begins with a section on factors influencing the patterns of language development. A second section explores continuity and change in language development over time. The third explores the impact on individuals with developmental language disorders (DLD), the effectiveness of available interventions, and broader issues about the need for equity in the delivery of services to those with DLD.

 
Discusses the origins of the individual differences in children's language development and how this changes over time
Develops a new conceptual framework for looking at individual differences in children's language development and language disorders and makes concrete links as to how this understanding informs policy and intervention
Shows the truly interdisciplinary nature of the field and collates the current 'state of the science' across these disciplines with respect to our understanding of child language development and its drivers

This volume reconsiders the problem of context in language testing and other modes of assessment from the perspective of transdisciplinarity. Transdisciplinary assessment research brings together collaborators who draw on the strengths of their differing backgrounds and expertise in order to address high-stakes complex socially-relevant problems. Traditional treatments of context in language assessment research have generally been informed by individualist cognitive theories within measurement and psychometrics. The additive potential of alternative social theories, including theories of genre, situated learning, distributed cognition, and intercultural communication, has largely been overlooked. In this book, the benefits of socio-theoretical reconsiderations of context are discussed and further exemplified in transdisciplinary research studies that investigate the use of assessment in classroom and workplace settings. The book offers a renewed view of context in arguments for the validity of assessment practices, and will be of interest to assessment researchers, practitioners, and students in applied linguistics, education, educational psychology, language testing, and other related disciplines and fields.