This document provides guidance for educational experts - researchers, textbook authors, teachers or curriculum developers - involved in analysing, comparing and developing educational media in a national or international context. It consist of an introduction, "Textbooks – instruments of education towards international understanding", followed by six chapters: I. Textbook revision, II. Methodology and pedagogy of bi- or multinational textbook projects, III. How to conduct a project: methodological issues and practical guidelines, IV. The challenges of the new media, V. Towards international cooperation: developments and perspectives, VI. The Georg Eckert Institute for International Textbook Research and the UNESCO International Textbook Research Network. The annex brings some practical advice for textbook reviewers.