Well known for their work in first language (L1) acquisition, Crain and Thornton (henceforth
C&T) have produced with their Investigations in Universal Grammar a thorough
review of the innovative experimental techniques they developed to investigate the acquisition of
syntax. In this sense, the volume would appear to be a kind of research-methods book. The
volume is a great deal more, however. Indeed, in the volume's three main sections (16, 8,
and 16 chapters, respectively), C&T present examinations not only of the nature of
human-language grammars but also of the factors that conspire to result in linguistic
performance. What makes the C&T volume superior is that they integrate theoretical
framework with methodological practice so seamlessly.