This introductory paper sets the scene for the present double special issue on degree phenomena. Besides introducing the individual contributions, it positions degree in the overlapping fields of intensity, focus and emphasis. It outlines the wide-ranging means of expressing degree, their possible categorizations, as well as the many-fold uses of intensification with respect to involvement, politeness, evaluation, emotive expression and persuasion. It also decribes the many angles from which degree features have been studied as extending across, e.g., (historical) sociolinguistics, (historical) pragmatics, and grammaticalization.