This volume, the sixth in the Vancouver series based on an annual conference at Simon Fraser University, collects papers that discuss the evidence and arguments regarding the inheritability and innateness of grammars. The evidence - which ranges from babies who are just beginning to learn the properties of their native language, to language-impaired adults who will never learn it - converges to show that whole precursors of language exist in other creatures, the abilities necessary for constructing fully fledged grammars are part of the biological endowment of human beings.