Trayectos is a two-volume, open online textbook for beginning second language learners of Spanish. The objective of this project is to apply the tenets of the Multiliteracies pedagogy Learning by Design, and of performance-based instruction and assessment, to the development of openly licensed educational resources (OER) for the teaching of Spanish to beginning and intermediate second language (L2) students. Even though this undertaking will first benefit learners in L2 Spanish classes at Texas A&M University, our main goal is to fully share the newly-developed resources with other national and international institutions. In addition, this project seeks to provide graduate students with opportunities for professional development in the areas of L2 pedagogy and OER.