Researchers must know what they are doing in their researches: the conccpts related and the methods: the natural or social nature of the inquiry: the viewpoints and attitude of the researchers towards the objects they are working on. If you want to study the curriculum, for example the exercise of power in the English course-books, then you can use research methods of Critical Educational Research. Exactly, can use Critical Discourse Analysis (CDA) mcthods. These methods will help reveal the inequality established in the course-books for solutions for that abolishment. This article will revise the conceptions of research and research methods with paradigms such as Positivism or Anti-positivism as the progress of history in scientific researching. It also offers the Critical Educational Research to be used for ideologies search in the curriculum. The author also suggests a link with Critical Discourse Analysis for a concrete study of English course-books.