This book is, in particular, about the different modes of evidence in labour law. It is noted that the Moroccan Labour Code does not contain any specific provisions relating to evidence. Thus, the employment relationship, as far as the issue of proof is concerned, is governed by Common Law, whether it is French legislation or its Moroccan counterpart - being deeply inspired by it since the protectorate. These are adapted to the specificity and imperatives of labour law. It deduces that the aim of this adaptation is to ensure that the inequality of the parties that characterises the employment contract is not reflected in litigation, in order to compensate for a de facto inequality.