Part I of this book provides conceptual and analytic tools to show how texts evoke worlds of meaning by representing content and using the resources of language, including relations with other texts, and other media, such as graphics. Part II to this point provides tools to examine how texts arise within and influence the living world of people and events. This final chapter proposes one more set of conceptual and analytic tools for viewing the work that texts do in society. This chapter provides means to identify the conditions under which they accomplish this work; to notice the regularity of texts in carrying out recognizably similar tasks; and to see how specific professions, situations, and social organizations can be associated with a limited range of text types. Finally, it provides methods to analyze how the orderly production, circulation, and use of these texts in part constitutes the very activity and organization of social groups. The analytical approach of this chapter relies on a series of concepts: social facts, speech acts, genres, genre systems, and activity systems. These concepts suggest how people using text create new realities of meaning, relation, and knowledge.