This book is the second volume of the Handbook of perceptual dialectology. Expanding on the coverage of both regions and methodologies, its aim is to underline the importance of considering folk (i.e., non-linguists') conceptions and perceptions of and responses to dialect phenomena in general, and to language differences in particular. Perceptual dialectology, or even “folk dialectology,” is nowadays understood – thanks to the work pioneered by Dennis Preston over the past two decades – as a multidisciplinary macro-linguistic and micro-sociolinguistic approach within the field of folk linguistics, an enterprise that, in general, gives added prominence to both linguistic structure and details of dialect production and perception differences and attitudes, complementing the more global approach of the social psychology of language. As we know, an important aspect of the complex social psychology of speech communities is the arbitrary and subjective intellectual and emotional response of the members of a society to the languages and varieties in their social environment: Different language varieties are often associated with deep-rooted emotional responses – in short, with social attitudes, such as thoughts, feelings, stereotypes, and prejudices about people, about social, ethnic and religious groups, and about political entities. These non-linguists' emotional responses and perceptions of dialects and dialect divisions may, paradoxically, not coincide with those proposed by linguists, since cultural, social, political, economic, or historical facts or other circumstances within the speech community may lead to the belief that there is a linguistic boundary or a sociolinguistic barrier where in reality there is none, or vice versa. Crucially important, then – as Preston's work has emphasized – is the comparison of scientific and folk characterizations of sociolectal and/or geolectal varieties and areas. Such an approach builds a more complete and accurate picture of the speaker's linguistic behavior, in the context of its complex social psychology, as well as of the regard for language use and variety within the community, in our sociolinguistically based search for an understanding of the dynamics of speech communities.