The Manifesto data are the only comprehensive set of policy indicators for social, economic and political research. It is thus vital that their quality is established. The purpose of this book is to review methodological issues that have got in the way of straightforwardly using the Manifesto data since our two preceding volumes were published and to resolve them in ways which best serve users and textual analysts in general. The book is thus generally about text-based quantitative analysis with a particular focus on the quality of the CMP-MARPOR data and ways of assessing and using them,...