After more than a decade of research the Bristol Study of Language
Development has assembled a corpus of data on the language development
of children aged one to five years that is representative both in terms
of the sample of children studied and of the situations in which their
spontaneous speech was recorded. In this book Gordon Wells, who directed
the project, presents a detailed account of the common sequence of
development that was observed, specifying the ages at which linguistic
categories emerged and the frequencies with which they were used at
successive ages. The data have been rigorously analysed and the book
also advances possible explanations for the developmental sequence
identified. Variations within the overall pattern did of course occur
and some of the more salient aspects are also discussed. The latter part
of the book discusses the influence of environmental factors and in
particular the role of adults in facilitating language development.