Dos mundos, a best-selling program for Introductory Spanish known for its exceptional progressive activities, made its name as an innovative pioneer in Beginning Spanish. Today, it has maintained the spirit of innovation through many successful editions and continues to be implemented in numerous beginning Spanish language classes across the nation with outstanding results. Based on the communicative approach, Dos mundos stresses the use of engaging activities in a natural and spontaneous classroom atmosphere. The Actividades de comunicación play a primary role in Dos mundos, since the core of the program is communication. These activities include fresh, practical ideas from the field of second-language teaching. In this research-based approach to learning language, the development of communicative language skills is the central goal, with formal grammar presentation and practice at the service of communication. To this end, the grammar explanations and exercises on the blue pages at the end of each chapter are designed for quick reference and ease of study. Additionally, cultural content is integrated throughout each chapter. The new Conozca section on each chapter opener gives an introduction of the country or region of focus, including information about holidays, foods, famous people, and important cities. Ventanas culturales readings focus on community, customs, and daily life while Ventanas al pasado readings focus on aspects of the social, cultural, or political history of the Spanish-speaking world The Enlace readings explore literature, music, and cinema, and the Lecturas present topics such as sports and leisure activities. Dos mundos is available with CENTRO a portal learning management system through which various digital components, including Quia™ Workbooks and Laboratory Manuals and interactive e-books can be purchased. This McGraw-Hill exclusive system offers a single log-in authentication for students and a single gradebook for instructors.