The Program in Expository Writing began with the millennium, in the academic year 2000–2001, bringing to Johns Hopkins a new approach to the teaching and learning of writing. The mission of the program is to encourage excellence in writing, across disciplines, through the teaching of expository writing, through the work of the Writing Center, and through its support of the writing-intensive requirement.
Offering an approach unique to Johns Hopkins University, "Expos" teaches students the elements of academic argument shared by all the disciplines. Students frame their arguments making use of what William Evans calls "The Paradigm of Academic Argument." Within this conceptual framework, students learn to summarize and analyze data, to evaluate sources, and to develop their thinking with evidence as they reason clearly and logically toward their own conclusions. Students trace the potential impact of their conclusions—their implications, consequences, or applications—and practice suggesting directions for future research or scholarship. All courses in Expository Writing help fulfill the university's writing, or "W," requirement.