This is the first English translation of Reinhart Koselleck's "Introduction" to the Geschichtliche Grundbegriffe (GG, Basic Concepts in History: A Historical Dictionary of Political and Social Language in Germany), which charts how in German-speaking Europe the accelerated changes occurring between the Enlightenment, the French Revolution and the Industrial Revolution were perceived, conceptualized and incorporated into political and social language, registering the transition from a hierarchy of orders to modern societies. The "Introduction" presents the problematic and method formulated in 1972 by Koselleck for writing the history of concepts (Begriffsgeschichte). During the twenty-five years needed to complete the GG, he continued to revise and develop this method. In prefaces written for subsequent volumes, he replied to criticisms of its choice of basic concepts and findings. In these prefaces Koselleck both summarized the great contribution to our historical knowledge of political and social terms that this work and its index volumes had made, and suggested further research projects to build upon its achievements.