This chapter discusses the principles of textual analysis as a means of gathering information and evidence in political research. Textual analysis has generated strong interest as a research method not only in Politics and International Relations, but also throughout the social sciences. In political research, two forms of textual analysis have become particularly prominent: discourse analysis and content analysis. The chapter examines discourse analysis and content analysis and explains the use of documents, archival sources, and historical writing as data. It considers the distinction between discourse analysis and content analysis, as well as the differences between qualitative and quantitative content analysis. It also describes the procedures that are involved in both quantitative and qualitative content analysis.