Abstract:Combining insights from Activity Theory (Engeström, 2014), mobile-assisted language-learning (MALL) (Stockwell and Hubbard, 2013), and computer-assisted language learning (CALL) research (Chapelle, 2001), this paper proposes three levels of teacher involvement in the adaptation and/or creation of MALL resources to enhance learner interaction with the target language and potentially contribute to the field of learner-computer interactions. Specifically, this paper (1) proposes three levels of teacher involvement in MALL material creation, moving from easily adaptable pre-made materials (e.g., Duolingo) to customizable materials (e.g., Quizlet) and finally to teacher-created materials (e.g., Moodle); (2) demonstrates how these levels of design can be implemented in a MALL context to increase target language interaction according to Activity Theory (e.g., how teachers can incorporate gaming features into their online courses); and (3) concludes with recommendations as to how MALL "engineers" can work together to enhance the overall L2 learning experience and potentially collaborate in research and in the design of pedagogical materials. From a pedagogical standpoint, through these three levels of teacher involvement in material creation, teachers can extend the reach of their classrooms by mobilizing the target L2 environments, depending on their MALL/CALL proficiency and/or interests. This approach also invites second language acquisition scholars from a wide range of technological abilities to contribute to CALL research.