In the continuing debate on the origins of creole languages, Lefebvre has long taken a strong stance in favor of an essential contribution of the West African substratum to the grammatical makeup of Haitian Creole; thus, she opposes both a universalist account along the lines of Derek Bickerton's bioprogram (e.g. 1984), and Robert Chaudenson's superstratist approach (e.g. 1992). Lefebvre's present book summarizes the main findings of two decades of research by herself and others (such as John Lumsden and Anne-Marie Brousseau) through various projects carried out at the Université du Québec à Montréal. The overall aim of this enterprise has been to test the hypothesis that adult speakers of the substratum languages, in creating a new creole language, use the properties of their native lexicons as well as the parametric values and semantic interpretation rules of their native grammars (9). In order to test this hypothesis, Haitian Creole is compared, on the one hand, with its superstratum or lexifier language, French, and on the other hand, with Fongbe (or Fon, belonging to the Gbe cluster of Kwa languages), as a representative of the substratum. Most of the book consists of the presentation of such three-way comparisons in regard to nominal structure (Chap. 4), the marking of tense, mood, and aspect (Chap. 5), pronouns (Chap. 6), clausal operators and the structure of the clause (Chaps. 7–8), the properties of verbs (Chap. 9), derivational affixes (Chap. 10), compounds (Chap. 11), and parametric options (Chap. 12). In all these areas, striking similarities between Haitian and Fongbe are revealed.