This chapter explores the principles of comparative research design as well as the issues and problems associated with different aspects of the approach. In particular, it considers the issue of case selection, the common sources of error that are associated with comparative research, and what can be done to try and avoid or minimize them. The comparative method is one of the most commonly used methods in political research and is often employed to investigate various political phenomena, including democratization, civil war, and public policy. The chapter discusses the three main forms of comparison, namely case study, small-N comparison, and large-N comparison. It also describes two main approaches used to select cases for small-N studies: Most Similar Systems Design and Most Different Systems Design. It also evaluates qualitative comparative analysis and concludes with an analysis of issues arising from case selection and data collection in large-N comparative research.
This chapter focuses on the distinctions between historical research and social scientific research, and how these are being challenged by scholars in pursuit of a genuinely ‘historical social science’. It begins with a discussion of historical approaches in Politics and International Relations, including historical events research, historical process research, and cross-sectional comparative research. It then examines three approaches for addressing temporality as the sequential active unfolding of social action and events: historical institutionalism, process tracing, and event structure analysis. It also explains how to locate essential historical information and evaluate various types of sources, and what special considerations need to be made in using documents, archival sources, and historical writing as data in historical research.