Numerous examples of research in the field of pedagogics which are using critical approach to discourse analysis show the diversity in theoretical background and methodology. An example of a group of critical approaches is Critical Discourse Analysis. The general framework of Critical Discourse Analysis is important both for maintaining the identity of CDA, thereby highlighting the reasonableness of this group of approaches, and for dissemination of knowledge concerning it, especially among less experienced researchers. The paper presents the basic assumptions of Critical Discourse Analysis and their implications for educational research as well as practical guidelines to apply to the CDA approach, which is represented by Ruth Wodak.