This book deals with obligations in all their evolving aspects.In this book, the author has had the privilege of addressing some new notions in the conventional world, notably, that relating to the incapacity of alcoholics, the elderly weakened by age, and the chronically ill to contract;In addition, the author demonstrates, within the framework of the present work, that cohabitants fully enjoy their matrimonial rights, by putting into dance a certain jurisprudence, however ignored or misunderstood by the quasi unanimity of the Doctrine treating it (cohabitation) as an immorality which can annihilate the legal acts carried out by the cohabitants within the framework of their marriageThe work deserves its weight in gold, to attract the attention of more than one reader animated by an evolutionary scientific intention.The present work also establishes a great correlation between the Law of Obligations and the contractual aspect of OHADA Law.This work is really, an essential tool for the practitioners of the Law more especially as it analyzes the obligations not only in their legal and jurisprudential aspects but also that jurisprudential.