Momento: Early-Stage Prototyping and Evaluation for Mobile Applications (in submission)

While it is important that applications designed for mobile devices be iteratively tested in natural contexts (e.g., by participants in the field), it is especially difficult both to develop mobile applications and to deploy them in the field. We built a system, MObile Messaging and EvalutioN TOol (Momento), to facilitate early stage development and field testing of mobile applications. Anyone who regularly uses a mobile device that supports text or media messaging can be a participant in studies using Momento, without having to install any software. Using our tool, developers can simulate and study applications in the field for a wide array of mobile applications without any device-specific development. Thus, Momento can support early-stage, medium to largescale Wizard-of-Oz field studies of participants using their